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01/01/2026
Naim Audio Community's NEW Thread:
"What’s the next bit of gear you’re planning to buy in 2026?"
https://community.naimaudio.com/t/what-s-the-next-bit-of-gear-you-re-planning-to-buy-in-2026/43072
拙宅おいては Chi-fi gear の完全駆逐を実現するために、欧米製の USB-to-spdif converter の購入を予定している。
なお、拙宅における Japanese hifi gear に対する完全駆逐は当の昔に完了している。
My Wish List 2026:
-ABBAS Audio USB-to-spdif converter (made in Ukraine!) <- From Ukraine
-WiiM Pro Plus (the latest) <- From UK
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書込番号：26378893
0点
02/01/2026
ABBAS Audio USB-to-spdif converter の入手可能性は極めて低そうなので、それに代わる他社の製品を検討しておく必要がある。
まあ、無難なところでは Audiophilleo2 MKII が候補に挙げられる。拙宅における Windows 11 (25H2) 環境下で問題なく動作する製品（現行品）が必須である。
http://www.audiophilleo.com/Audiophilleo2
ということで、そのうち AudioPhilleo 社に商品購入のために直接コンタクトを取る予定である。
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書込番号：26379713
0点
02/01/2026
My Wish List 2026 (Updated):
-Audiophilleo2 MKII + Audiophilleo PurePower MKII in Gold (US) <- From US
-WiiM Pro Plus (2025 or 2026) <- From UK
http://www.audiophilleo.com/PurePower
これで拙宅における USB Audio System (Computer Audio System) は完結するはずである。
さらば、Chi-fi gear よ！
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書込番号：26379741
0点
02/01/2026
＞まあ、無難なところでは Audiophilleo2 MKII が候補に挙げられる。拙宅における Windows 11 (25H2) 環境下で問題なく動作する製品（現行品）が必須である。
とは言ったものの My Google AI に尋ねて見たところ、問題は簡単では無さそうである。
ともかく、原典文献に一つ一つ当たって見る必要が出て来た。
Question:
"is the audiophilleo 2 mk2 working well enough under windows 11 (25h2)?"
My Google AI's Answer:
"As of January 2026, the Audiophilleo 2 MKII faces significant stability challenges under Windows 11 version 25H2. Users and audio professionals report widespread audio degradation and driver failures following this specific feature update.
Reported Issues with Windows 11 25H2
The transition to 25H2 has introduced kernel-level changes to the Windows audio stack that negatively impact legacy and specialized audio interfaces:
-Audio Degradation: Users have reported "crumble noise," robotic sound quality, and high-frequency distortion after updating to 25H2.
-Driver Incompatibility: Older proprietary drivers—like those originally designed for Windows 7/8/10 for Audiophilleo devices—may no longer load due to stricter driver signature verification and changes to Windows ASIO implementations.
-Connectivity Failures: Some updates have been known to "nuke" USB port functionality or disable existing sound drivers entirely during the patch process.
Performance vs. Older Versions
-High Sample Rates: While the Audiophilleo 2 MKII is a Class 1.0 device that can run on native drivers up to 96kHz, sample rates above that (up to 192kHz) require custom drivers originally validated for Windows 10.
-Windows 11 Stability: Some users find Windows 11 audio quality inferior to Windows 10, citing a narrowed soundstage and loss of punch, which they attribute to changes in Microsoft's background audio processing.
Recommendations for 2026
If you intend to use the Audiophilleo 2 MKII on a 25H2 system:
1. Check Firmware: Ensure you are on the latest firmware; older versions are known to cause occasional pops or clicks on modern operating systems.
2. BIOS Optimization: Disable all power-saving features (C-states, USB selective suspend) in your BIOS, as 25H2's power management can cause the USB audio stream to hang.
3. Manual Reinstallation: If the device is not recognized, manually uninstall all references to it in Device Manager and perform a clean installation of the legacy driver.
4. Use WASAPI: For the best stability on Windows 11, use WASAPI (Event Style) in your media player rather than ASIO, as it often bypasses newer driver-related conflicts.
For official support, contact Audiophilleo directly at support@audiophilleo.com."
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書込番号：26380090
0点
03/01/2026
AudioPhilleo 社の website における "Support" を見ると同社の最近 (2020-) の動向がどうなんだろうかという一抹の不安を感ずる。
http://www.audiophilleo.com/Home/Support
ともかく、同社に対しては直接コンタクトを取る以外に本当のことは分からんということである。
書込番号：26380236
0点
03/01/2026
USB-to-spdif converter であるが、Windows 11 (25H2) 環境下で「確実に問題なく動作する製品」に絞ることにした。Computer Audio に対しては段々面倒くさい気分でいる。
ということで、やはり Berkeley Audio Design 製品に落ち着いた模様である。
My Wish List 2026 (Revised):
-Berkeley Audio Design Alpha USB Series 2 (US) <- From US
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書込番号：26380698
0点
04/01/2026
所詮、Computer Audio は Streaming Audio よりも格下である。
Streaming Audio ならば WiiM Pro Plus でもう十分なのに Computer Audio においてはどうして Berkeley Audio Design Alpha USB Series ($2495) までも投資しなければいけないのは甚だ疑問である。
かといって、中華物は御免被りたい。ともかく拙宅におけるこの状況には困ったものである。
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書込番号：26381182
0点
04/01/2026
これが現時点での結論である。
My Wish List 2026 (Revised):
-An appropriate non-china-made usb-to-spdif converter that can work perfectly enough under Windows 11 (25h2)
-------------------------
My Google AI's Answer:
"MUTEC MC-3+ Smart Clock USB (Made in Germany)"
Description: A professional-grade digital-to-digital converter (DDC) and master clock. It is highly regarded for its isolation and jitter reduction.
Compatibility: Fully compatible with Windows 11 as a high-end USB audio interface.
Official Product Page: MUTEC MC-3+USB
"Schiit Audio Eitr (Made in USA)"
Description: A dedicated USB-to-SPDIF bridge using Schiit's proprietary "Unison" or Gen 5 USB technology to provide a clean coaxial output.
Compatibility: Uses standard USB Audio Class drivers, meaning no additional software is required for Windows 10/11.
Official Product Page: Schiit Audio Eitr (Note: Check availability as this product is frequently cycled in and out of their active lineup).
"Berkeley Audio Design Alpha USB (Made in USA)"
Description: An ultra-high-end asynchronous USB-to-SPDIF/AES converter designed specifically for audiophile systems.
Compatibility: Known for stable, high-performance operation in Windows environments, though it occupies a much higher price bracket.
Product Info: Berkeley Audio Design
"Hifime UT23 / S2 Digi (Designed in UK/Europe, some components sourced globally)"
Description: Affordable, compact converters that use high-quality chipsets (often SAVIAUDIO or XMOS) to output optical or coaxial signals.
Compatibility: Verified to work well with Windows 11 due to UAC2 compliance.
Store Link: Hifimediy UT23
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書込番号：26381315
0点
04/01/2026
Schiit Audio Eitr (Factory Refurbished, as new) が運良く eBay US に出品されていることを知った。
早速、Make offer を提出し、それが直ちに許可されたので交渉成立となった
なお、拙宅ではドイツ製品には興味がないので巷の評判の有無に関わらず Mutec 製品は最初から選考外であった。
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書込番号：26381468
0点
05/01/2026
USB-to-spdif converter の選定にあたって今回も My Google AI が大いに役立った。心より感謝である。
特に、当初の選定対象にはなかった Schiit Audio Eitr の提案は決定的な出来事であった。
ということで今年の滑り出しも上々である。
Naim Audio Community's Thread:
"What was the last bit of gear you bought in 2026?"
https://community.naimaudio.com/t/what-was-the-last-bit-of-gear-you-bought-in-2026/43078
拙宅においては、
-Schiit Audio Eitr w/o Power Supply,
-Schiit Audio Eitr w/ Power Supply
である。
----------------------------
Question:
"how is the schiit eitr ddc in terms of prat, when used under windows 11 version 25h2?"
My Google AI's Answer:
"In terms of PRaT (Pace, Rhythm, and Timing), the Schiit Eitr remains a highly regarded DDC (Digital-to-Digital Converter) even under Windows 11 version 25H2, primarily because it operates as a driverless UAC2-compliant device.
Here is how it performs in the context of Windows 11 25H2:
PRaT and Sonic Character
-Enhanced Timing and Jitter Reduction: The Eitr uses Schiit’s Gen 5 USB technology, which provides complete electrostatic and electromagnetic isolation via transformers and dedicated precision clock sources. This design is specifically intended to improve the "tunefulness" and "musicality" of the signal by reducing jitter, which directly enhances the perceived sense of PRaT.
-Blacker Background: Users report a "holy crap" moment when moving from standard USB to the Eitr's coaxial output, noting a much lower noise floor and better dynamic range, which allows rhythmic nuances to be more easily discerned.
-Improved Clarity: While the raw character of your DAC remains the same, the Eitr adds a discernible improvement in resolution and "air" around instruments, contributing to a more coherent and well-timed presentation.
Performance on Windows 11 Version 25H2
-Native Compatibility: As a UAC2-compliant device, the Eitr does not require proprietary drivers. It has been confirmed to work "perfectly enough" or "without issue" on Windows 11 25H2 systems, bypassing many of the driver-related audio bugs (like "robotic" sound or popping) that have affected other devices in this update.
-System Latency Concerns: Some users have reported general system stuttering or game lag after updating to 25H2. Since PRaT is highly sensitive to timing, ensure your system is optimized:
-Power Management: Disable USB Selective Suspend in Windows power settings to prevent the USB port from entering a low-power state, which can cause micro-stutters in the audio stream.
-Reinstallation: If you experience "crumble" noise or stuttering, a manual reinstall of the 25H2 update has been shown to resolve underlying OS-level audio issues.
-Stability: Despite reports of broken audio stacks for some Realtek and USB-1.0 devices in the 25H2 update, Schiit’s USB implementation remains stable because it avoids the kernel-level driver issues currently affecting non-standard interfaces.
For a reliable experience on 25H2, it is recommended to use the Schiit Audio product guide to ensure your specific DAC pairing is optimized for the Eitr's coaxial output."
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書込番号：26381930
0点
05/01/2026
拙宅での Windows 11 Version 25H2 現環境下でも Matrix Audio X-SPDIF 2 は問題なく動作しているが、My Google AI にはもう一仕事をお願いして見た。
Question:
"how is the matrix audio x-spdif 2 ddc in terms of prat, when used under windows 11 version 25h2?"
My Google AI's Answer:
"As of January 2026, the Matrix Audio X-SPDIF 2 remains a capable DDC, though its performance under Windows 11 version 25H2 is currently hampered by significant OS-level stability issues affecting high-fidelity audio output.
PRaT (Pace, Rhythm, and Timing) Performance
The X-SPDIF 2 is historically praised for its impact on PRaT when functioning correctly:
-Precision and Timing: Its built-in femtosecond clocks and FPGA processing unit significantly reduce jitter, which directly enhances the perceived "tightness" and rhythmic accuracy (Pace) of the audio.
-Dynamic Clarity: By converting USB to I2S or AES/EBU, it often provides a more focused and "lucid" soundstage compared to direct USB connections, improving the rhythmic drive of complex tracks.
-External Power Influence: Utilizing an external linear power supply (LPS) can further refine timing by isolating the unit from noisy USB bus power, though some measurements suggest USB power alone is often sufficient for baseline performance.
Known Issues with Windows 11 25H2 (2026 Status)
While the hardware is robust, the 25H2 update has introduced kernel-level changes to the Windows audio stack that negatively impact specialized audio interfaces:
-ASIO Instability: Many professional audio interfaces and DDCs using proprietary drivers are reporting ASIO instability and driver failures following the 25H2 update.
-Audio Degradation: Users have reported "crumble noise" and robotic sound quality on various audio devices after updating to 25H2, which may interfere with the intended PRaT of high-end DDCs like the X-SPDIF 2.
-Driver Signature Issues: Stricter driver verification in 25H2 may cause older proprietary drivers - essential for full X-SPDIF 2 functionality (like high sample rate DSD) - to fail to load.
Recommendations for Use
-Driver Management: Ensure you are using the latest Matrix Audio Drivers. If instability occurs under 25H2, some users have found success rolling back to the Microsoft Generic USB Audio Class 2.0 driver, though this may limit advanced features like native DSD.
-External Power: To maximize PRaT and bypass potential USB power fluctuations caused by OS instability, use a dedicated external power supply (under 9V).
-Connection Choice: For the best rhythmic timing and "weight," the I2S (via HDMI) or AES/EBU outputs are recommended over Coaxial or Toslink."
書込番号：26381946
0点
05/01/2026
そうこうしている間に、拙宅に来るべき Schiit Audio Eitr w/o Power Supply のために 3rd party power supply replacement を探し回っていたところ、幸運にも "6VAC-AC Adapter For Elektron Machinedrum SPS-1 MK1" が eBay US にて出品中であるので1個発注した。これは中国製であるがやむを得ないであろう。
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書込番号：26381999
0点
06/01/2026
全く同じ質問に対する My Google AI の回答内容は時間によって変化するが、以下が本日の回答内容である：
Question:
"how is the schiit eitr ddc in terms of prat, when used under windows 11 version 25h2?"
My Google's Answer as of January 6, 2026:
"In terms of PRaT (Pace, Rhythm, and Timing), the Schiit Eitr DDC remains highly effective under Windows 11 version 25H2. Its performance is largely defined by its ability to resolve timing issues inherent in standard computer USB outputs.
PRaT and Performance Characteristics
Under Windows 11 25H2, the Eitr continues to deliver the following sonic benefits:
-Enhanced Timing and Focus: Users report that complex passages and intense layering become easier to follow, with multi-tracked vocals becoming more distinct.
-Improved "Musicality": The device is described as making tracks more "tuneful" and enjoyable, often removing the "edginess" typically associated with digital USB playback.
-Blacker Backgrounds: By providing galvanic isolation via transformers and using precision crystal local clocks for 44.1k and 48k multiples, it significantly lowers the noise floor.
Windows 11 Version 25H2 Compatibility
-Driverless Operation: The Eitr is a UAC2-compliant (USB Audio Class 2) device, meaning it requires no additional drivers to function on Windows 11. It is recognized natively by the OS.
-Stability: Despite reports of general audio issues with some internal Realtek drivers in version 25H2, the Eitr is noted to work reliably because it bypasses standard computer soundcard software.
-Known Issues & Fixes: USB Power Management: Windows 11 can be aggressive with power saving. If you experience dropouts, it is recommended to disable USB selective suspend in Power Options.
-Sleep Mode: If the Eitr is not recognized after the computer wakes from sleep, a full reboot or disabling "Allow the computer to turn off this device to save power" in Device Manager for the USB root hub is often required.
Summary Table for 2026
Feature - Status under Windows 11 25H2
Driver Requirement - None (Native UAC2 Support)
PRaT Impact - High; improves rhythmic drive and clarity
Isolation - Full galvanic isolation via transformers
Common Fix - Disable USB Selective Suspend in Power Settings"
書込番号：26382471
0点
06/01/2026
My Computer Audio Diagram (as of January 2026):
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> Naim Audio NAP100 Power Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
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これにて Chi-fi gear の呪縛からやっと解放されて自由の身となったわけである。
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書込番号：26382755
0点
07/01/2026
My Computer Audio Diagram II (as of January 2026):
PC (Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Trilogy Audio H1 Energizer (RCA IN/HP OUT) >> Stax SR-007Mk1 Electrostatic Headphones
書込番号：26383441
0点
08/01/2026
My Computer Audio Diagram III (as of January 2026):
PC (Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> Trilogy Audio H1 Energizer (RCA IN/HP OUT) >> Stax SR-007Mk1 Electrostatic Headphones
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Trilogy Audio H1's Preamplifier Section を Townshend Audio Allegri+ Passive Preamplifier に受け持たせるということである。
書込番号：26384034
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09/01/2026
My Computer Audio Diagram IV (as of January 2026):
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
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現在、Mjolnir Audio SRD-7 Electrostatic Energizer について調査中である。その利点は手持ちの Amplifier が手軽に利用出来るということであるが。
書込番号：26385107
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09/01/2026
もし入手するとしたら以下のモデルであろう。
https://mjolnir-audio.com/electrostatic-amps/
Mjolnir Audio SRD-7 Energizer, Lundahl Trafo Model:
As an offshoot of the SRD-7 below, I’ve made a few units with Lundahl transformers instead of the Stax units. The rest of the circuitry is mostly the same except the Lundahl units are further upgraded with better power transformers, better parts and upgraded wiring. What the Lundahl transformers bring to the table is a much larger core, C-core at that, with very much improved wiring. They are a bit lower in ratio compared to the Stax units, so they need more voltage (or gain) to get get to the same output level. The lower ratio means less distortion and over all losses in the transformers too for much better performance.
They can be set to either 115V or 230V via the internal voltage selector and will be preset before shipping out.
Price: 1450$ plus shipping
書込番号：26385274
0点
10/06/2026
My Wish List 2026 (Updated):
-Mjolnir Audio SRD-7 Energizer, Lundahl Trafo Model (brand-new);
-Stax SRD-7 Mk2 Energizer in perfectly working order
後者はそのうちに日本国内で見出すことが出来るであろう。
書込番号：26385370
0点
10/01/2026
My Computer Audio Diagram V:
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> Naim Audio NAP100 Power Amplifier (RCA IN/SP OUT) >> Mjolnir Audio Lundahl SRD-7 Energizer (SP IN/HP OUT) >> Stax SR-007mk1 Electrostatic Headphones
書込番号：26386039
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12/01/2026
Mjolnir Audio SRD-7 Energizer, Stax Trafo Model:
People have been asking for years to do some transformer boxes (or energizers) to drive electrostatic headphones and here they are with a brand new version. Over the years I’ve accumulated a large number of Stax transformer boxes, some of which I have converted to pro bias but most have been scrapped. The only things I saved were the transformers and the Stax sockets. So what I did here is to put the excellent transformers into a much better enclosure with my own bias supply to maximize their potential. On top of that the input to the transformers is protected from overload and the output has a clamp circuit so it can never damage the headphones connected to it. This is a fully passive circuit which only kicks in if the transformer peaks at roughly 550Vpp, 1100Vppss. Any higher than that and you run the risk of damaging Pro bias headphones.
There is nothing here in the signal path except the transformers and the input protection circuitry. The left and right channels are also isolated so no issues with using bridged amps. A common ground will turn them into smoke right quick so I would never set it up like that. The boxes can be set for either 117V or 230V with an internal switch.
The latest version now has a new chassis design to be more inline with my other amps, R-core power transformer and numerous other improvements.
Price: 820$ plus shipping
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ともかく、SRD-7 方式がいかなるものかを体験するためも Stax SRD-7 mk2 in perfect working order を格安で入手して実験して見ることにするか。その実験結果に対する期待度は極めて低いが。
（続く）
書込番号：26387122
0点
13/01/2026
＞ともかく、SRD-7 方式がいかなるものかを体験するためも Stax SRD-7 mk2 in perfect working order を格安で入手して実験して見ることにするか。その実験結果に対する期待度は極めて低いが。
この方式の最善策であるが、
① 世界最高クラスの Power Amplifier(s) と併用（接続）する。
② 世界最高クラスの Transformers を内蔵している SRD-7 を使用する。
の2点であろう。
上記②において、STAX 製品あるいは既成の Lundahl 製品では残念ながらこの基準をクリアすることはおそらく出来ないであろう。
ということは、この方式がさらに発展する余地は皆無に近いかも知れない。もし、現在までにその余地があったならば新たにどこかで商品化していただろうに。
という訳で、あくまでも格安 (\10,000 前後）な中古 STAX SRD-7 mk2 を用いた実験の域を出ないのである。
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書込番号：26387962
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13/01/2026
Naim Audio Community's Thread:
"dCS Varese"
https://community.naimaudio.com/t/dcs-varese/43219
dCS Varese は Computer Audio にも対応しているのであろうか？
ということで、My Google AI に尋ねて見た。
Question:
"how is the usb-to-spdif converter section of the dcs varese in sound quality compared to the berkeley audio alpha usb (latest version)?"
Answer:
添付画像のとおり。
-----------------------------------
dCS Varese は Computer Audio の存在など無視してもよかろう。それにしても My Google AI は Berkeley Audio 製品を異常に高く評価しているな。
書込番号：26388226
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17/01/2026
STAX SRD-7 Mk2 Energizer を運よく「格安で」入手出来た場合を考慮して、それに使用すべき 4 Banana Plugs を前もって準備することにした。
第一候補である DELTRON BANANA PLUGS GOLD Plated Large Solder/Screw Bucket * 584 Series があいにく、拙宅にて利用している店舗では現在品切れ中ということで、他社製の製品を探すことにした。
そこで、落ち着いた先は、QED SCREWLOC ABS 4MM Banana Plugs であった。
もちろん、 UK-based manufacturer 製の banana plugs で何か良さそうなものはないか？と My Google AI にて質問済みである。
-----------------------
dCS Varese
https://community.naimaudio.com/t/dcs-varese/43219
に刺激を受けて、拙宅では YouTubes 経由で dCS Varese の試聴を行うことにした。
https://www.youtube.com/results?search_query=dcs+varese+absolute+sounds
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書込番号：26391137
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20/01/2026
拙宅内には4機種の DACs が存在しているが、そのうち2機種は既に断捨離箱に保管中である。
現在は、主に Musical Fidelity V90-DAC を使用しているが、その上位機に相当する Music Fidelity MX-DAC も使い始めることにした。それに対する AC/DC Adapter であるが MX-DAC 付属品は使用せずに、その代わりに MeanWell GSM18U05-P1J (5VDC/3.0A) を使用することにした。
この組み合わせで Windows 11 Version 25H2 環境下において完全動作していることは確認済みである。
（続く）
書込番号：26393433
0点
21/01/2026
Coming to my house soon by International Postal Services:
-Schiit Audio Etir DDC w/ Power Supply;
-Schiit Audio Etir DDC w/o Power Supply;
-6VAC-AC Adapter For Elektron Machinedrum SPS-1 MK1.
これらが届けば拙宅での非中華 Computer Audio System が完成である。
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書込番号：26394271
0点
24/01/2026
My Simpler Computer Audio System:
PC (Windows 11 25H2; USB OUT) >> Musical Fidelity MX-DAC (USB IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
---------------------------
Musical Fidelity MX-DAC の USB Section がきちんと設計されているようでこの簡易システムでも音楽を「十分に」楽しむことが出来るのは、
Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
の組み合わせがかなり効果的であるということであろう。
（続く）
書込番号：26396961
0点
25/01/2026
My Wish List 2026 (Revised):
-STAX SRD-7 Mk2 Energizer in perfectly working order
-------------------------
STAX SRD-7 ならば日本国内中古市場において多数見出せるが、SRD-7 Mk2 の方は現在のところさっぱりである。果報は寝て待て、ということか。
なお、Mjolnir Audio SRD-7 Electrostatic Energizers の購入であるが、その価値が未だに見出せず当分の間見送ることにした。
書込番号：26396973
0点
25/01/2026
＞dCS Varese
https://community.naimaudio.com/t/dcs-varese/43219
に刺激を受けて、拙宅では YouTubes 経由で dCS Varese の試聴を行うことにした。
https://www.youtube.com/results?search_query=dcs+varese+absolute+sounds
dCS Varese に対する YouTubes を聴いて見たが、それらの印象は全く良くない。
まあ、私が dCS 製品が大嫌いであるから当然と言えば当然であるが。
dCS は所詮 dCS であるなということだけは再認識出来たことが収穫であった。
書込番号：26397142
0点
25/01/2026
Naim Audio Community's Thread:
"Best value piece of Hifi or accessory"
https://community.naimaudio.com/t/best-value-piece-of-hifi-or-accessory/42734
拙宅においては断然 WiiM Pro Plus (not WiiM Pro) である。
他人による推薦品を知ることも拙宅にとっては掘り出し物を見つけるように実に楽しいものである。
書込番号：26397153
0点
25/01/2026
MY Rubbish Hi-Fi Gear 2025:
-STAX SRM-270S Energizer, SOLD;
-Venture Electronics Devastator USB Dongle DAC, TO BE FOR SALE;
-Bluesound NODE N130 (2021) Network Streamer, TO BE FOR SALE.
------------------------
いずれも少々の期待を抱いて安価であることに釣られて衝動買いしたものばかりである。
ということで STAX SRD-007 Mk2 購入に対しては今まで以上の細心の注意が必要である。
書込番号：26397185
0点
26/01/2026
久しぶりに My Google AI を試して見た。これが正答かどうかを確かめるのは現在輸送中 (US -> JPN) の Schiit Eitr が拙宅に届いてからのお楽しみである。
Question:
"From computer audio sources which is the better choice in sound quality between the following options (a) and (b)?
(a) the musical fidelity mx-dac (usb input option) to the nad d 3020 v2,
(b) the schiit audio eitr ddc to the musical fidelity mx-dac (coaxial input option) to the nad d 3020 v2."
My Google AI's Answer:
"Option (b), utilizing the Schiit Audio Eitr DDC to the Musical Fidelity MX-DAC via coaxial input, is likely to provide a better sound quality due to the Eitr's ability to isolate noise and improve the signal integrity from a computer source, which often results in a cleaner, more detailed sound. Option (a) relies on the computer's USB output directly, which can be a source of electrical noise and jitter that might negatively impact the sound quality, depending on the computer's design.
Detailed Comparison
The key difference lies in how the digital signal from the computer is handled before it reaches the digital-to-analog converter (DAC) stage within the Musical Fidelity MX-DAC.
Option (a): Direct USB Connection
Signal Path: Computer (USB output) -> Musical Fidelity MX-DAC (USB input) -> NAD D 3020 V2
Potential Issues:
-Noise and Jitter: The USB connection from a general-purpose computer can carry electrical noise from the PC's power supply and other internal components. While the Musical Fidelity MX-DAC has an asynchronous USB input, which is designed to manage jitter, it may still be susceptible to some noise.
-Sound Profile: Depending on the specific PC and the MX-DAC's implementation, the sound might be slightly less refined compared to a cleaner source.
Option (b): Schiit Audio Eitr DDC(USB to Coaxial)
Signal Path: Computer (USB output) -> Schiit Audio Eitr (USB to Coaxial conversion) -> Musical Fidelity MX-DAC (coaxial input) -> NAD D 3020 V2
Potential Advantages:
-Signal Isolation/Re-clocking: The Schiit Audio Eitr is a Digital-to-Digital Converter (DDC) that uses Schiit's proprietary Gen 5 USB technology to isolate the USB signal from the computer's noise and re-clock the data, resulting in a cleaner S/PDIF (coaxial) output signal with lower jitter.
-Improved DAC Performance: By providing a cleaner, re-clocked coaxial signal, the Eitr allows the Musical Fidelity MX-DAC's internal DAC to work with a more optimal signal, potentially leading to a lower noise floor, better clarity, and improved dynamics. Reviewers have reported "tremendous" improvements with the Eitr in systems that were previously susceptible to PC noise.
Conclusion
Reviewer and expert opinions suggest that the Schiit Eitr can offer a significant improvement in measured and audible performance by isolating and re-clocking the USB signal from a noisy computer source. The Musical Fidelity MX-DAC is an excellent performer, and providing it with the cleanest possible digital signal via the Eitr' coaxial output should yield the best results for sound quality in your specific setup."
書込番号：26398422
0点
26/01/2026
ダメ押しの質問も My Google AI に投げかけて見た。まあ、My Google AI がどの程度 PRaT に関して理解しているかは甚だ疑問であるが。
Question:
"from computer audio sources which is the better choice in terms of prat between the following options (a) and (b)?
(a) the musical fidelity mx-dac (usb input option) to the nad d 3020 v2,
(b) the schiit audio eitr ddc to the musical fidelity mx-dac (coaxial input option) to the nad d 3020 v2."
My Google AI's Answer:
"Option (b) is generally considered the better choice for optimizing PRaT (Pace, Rhythm, and Timing), though the difference may be subtle depending on the resolution of your overall system.
Why Option (b) is Superior for PRaT
The inclusion of the Schiit Audio Eitr provides several technical advantages over the standard USB implementation in the Musical Fidelity MX-DAC:
-Galvanic Isolation: The Eitr uses high-quality isolation transformers to decouple the computer's noisy USB power and ground from the audio signal. This reduces low-level "digititis" and background noise, which often allows the natural timing and leading edges of notes to emerge more clearly.
-Precision Reclocking: While the MX-DAC is an asynchronous USB design, the Eitr's "Gen 5" USB technology uses dedicated, high-precision crystal oscillators for both 44.1kHz and 48kHz multiples. This rigorous reclocking before the signal reaches the DAC often results in a more "snappy" and rhythmically coherent presentation.
-Optimized SPDIF Conversion: Many listeners find that converting USB to a well-implemented Coaxial (SPDIF) signal results in better "attack" and bass control - key components of PRaT - compared to direct USB.
Performance Considerations
-The MX-DAC's Strengths: The Musical Fidelity MX-DAC is already praised for being "rhythmically deft" and having a "vibrant and enjoyable feel" even when used via direct USB.
-System Synergy: The NAD D 3020 v2 is a highly capable but compact amplifier. In a system of this level, the Eitr's primary benefit will be a "cleaner" and "more focused" sound.
-Connection Recommendation: To maximize the benefits of option (b), use a high-quality 75-ohm coaxial cable (such as a Blue Jeans Cable) between the Eitr and the MX-DAC
.
Summary: While the Musical Fidelity MX-DAC performs admirably on its own (Option a), the Schiit Eitr (Option b) acts as a "bridge" that cleans up computer-side timing errors and electrical noise, providing a slight but noticeable edge in rhythmic precision and musical drive."
書込番号：26398446
0点
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27/01/2026
UpTone Audio USB REGEN 導入後に関する質問である。
QUESTION:
"From a computer audio source which is the better choice in terms of prat between the following options (a) and (b)?
(a) computer (usb output) -> uptone audio usb regen -> musical fidelity mx-dac (usb input) -> nad d 3020 v2,
(b) computer (usb output) -> uptone audio usb regen -> schiit audio eitr (usb to coaxial conversion) -> (musical fidelity mx-dac (usb input) -> nad d 3020 v2."
MY GOOGLE AI'S ANSWER:
"Between the two options, option (b) is likely the better choice in terms of PRAT (Pace, Rhythm, and Timing), because the additional galvanic isolation provided by the Schiit Audio Eitr USB-to-coaxial converter in that chain can more effectively isolate the system from the computer's inherent electrical noise.
The UpTone Audio USB REGEN already helps clean up the USB signal, but adding the Schiit Audio Eitr
introduces another layer of isolation by converting the signal to coaxial S/PDIF, a connection type generally more immune to conducted electrical interference than USB's combined power and data lines. This superior isolation often translates into a "tighter" and more "precise" sound, which aligns with improvements in PRAT.
Component Analysis
-UpTone Audio USB REGEN: This device is designed to regenerate the USB signal, provide a low-noise power source to the DAC's USB input, and reduce "packet noise modulation". Reviewers often note improvements in soundstage and separation, leading to a "smoother" and more "liquid" sound.
-Schiit Audio Eitr: This is a high-quality USB-to-S/PDIF (coaxial) converter that provides galvanic isolation. The S/PDIF signal is generally less susceptible to the ground-plane noise and interference that can travel along the USB power line from a computer. Audiophiles often describe the result of galvanic isolation and proper S/PDIF implementation as having better immediacy, tighter bass, and snappier presentation, which directly relates to improved PRAT.
-Musical Fidelity MX-DAC and NAD D 3020 V2: Both are quality components, and the improvements in PRAT will depend on how well their respective inputs handle noise and timing, and how they interact with the upstream components.
Ultimately, many audiophiles suggest trying both options if possible to see which one sounds best in a specific system, as results can vary. However, based on the technical design principles and common listening impressions, option (b) provides a more robust approach to isolating the digital audio signal from computer noise, which should theoretically yield better PRAT."
書込番号：26399110
0点
27/01/2026
My Google AI の回答は時間とともに変容している。結局、一貫性がないのである。
QUESTION:
"From a computer audio source which is the better choice in terms of prat between the following options (a) and (b)?
(a) computer (usb output) -> uptone audio usb regen -> musical fidelity mx-dac (usb input) -> nad d 3020 v2, (b) computer (usb output) -> uptone audio usb regen -> schiit audio eitr (usb to coaxial conversion) -> (musical fidelity mx-dac (usb input) -> nad d 3020 v2."
MY GOOGLE AI'S ANSWER:
"In terms of PRAT (Pace, Rhythm, and Timing), system option (a) is likely the better choice because the Musical Fidelity MX-DAC's USB input is generally high-quality and avoids the additional conversion step that may affect timing precision inherent in option (b). The final choice, however, is subjective and system-dependent, so testing both is recommended.
Option (a) Analysis
-Signal Path: computer (USB output) -> UpTone Audio USB REGEN -> Musical Fidelity MX-DAC (USB input) -> NAD D 3020 V2
-PRAT: The UpTone Audio USB REGEN is specifically designed to regenerate the USB data signal and provide clean power, which can lead to a more stable and accurate signal timing, crucial for PRAT. Reviewers often note improvements in image stability, clarity, and overall musical engagement. The direct USB connection to the MX-DAC, especially if well-designed, can maintain high data integrity and leverage the DAC's internal clocking for optimal performance.
Option (b) Analysis
-Signal Path: computer (USB output) -> UpTone Audio USB REGEN -> Schiit Audio Eitr (USB to coaxial conversion) -> Musical Fidelity MX-DAC (coaxial input) -> NAD D 3020 V2
-PRAT: The Schiit Audio Eitr effectively provides galvanic isolation and uses its own precision clocks to convert USB to a coaxial S/PDIF signal. This can eliminate electrical noise from the computer, which is beneficial for a dark background and detail retrieval. However, this path introduces an additional conversion step and relies on the S/PDIF input and clocking of the MX-DAC, which may or may not be better in terms of timing than its USB input. Some users have found that while the Eitr improves clarity, the resulting sound can sometimes be less "immediate" or too smooth depending on the system matching.
Ultimately, both systems aim to reduce noise and improve signal integrity from a computer source, which generally aids PRAT. However, expert and user opinions suggest the impact is subtle and highly dependent on the specific combination of equipment. Option (a) is a more direct path that leverages the REGEN's specific placement at the DAC for optimal signal integrity, potentially offering a more direct and articulate presentation. Option (b) uses S/PDIF's inherent galvanic isolation to potentially achieve the same goal through a different technical approach."
書込番号：26399222
0点
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|---|
27/01/2026
一応もっともらしい説明はしているが、その内容には深みが欠如している。
QUESTION:
"From a computer audio source which is the better choice in terms of prat between the following options (a) and (b)?
(a) computer (usb output) -> uptone audio usb regen -> musical fidelity mx-dac (usb input) -> nad d 3020 v2,
(b) computer (usb output) -> uptone audio usb regen -> matrix audio x-spdif 2 (usb to coaxial conversion) -> musical fidelity mx-dac (usb input) -> nad d 3020 v2."
MY GOOGLE AI'S ANSWER:
"Option (b), which incorporates the Matrix Audio X-SPDIF 2 (USB to coaxial converter), is likely the better choice for improved PRaT (Pace, Rhythm, and Timing), as dedicated digital-to-digital converters (DDCs) are often specifically designed with high-quality clocking to optimize the digital signal before it reaches the DAC's input stage.
Rationale for Option (b)
-Dedicated DDC Advantage: The Matrix Audio X-SPDIF 2 is a dedicated digital-to-digital converter (DDC) with excellent clocking, specifically designed to reclock the signal and output a cleaner, more stable digital stream via S/PDIF (coaxial). This can result in a more natural timbre and clearer sound compared to a standard USB input on some DACs.
-Optimal DAC Input: While the Musical Fidelity MX-DAC has a high-quality asynchronous USB input, some users and manufacturers suggest that a well-implemented coaxial input fed by an isolated and properly clocked digital stream can sound better than the USB input, potentially due to the different ways the clock is managed (asynchronous USB allows the DAC to be master clock, while S/PDIF requires the clock to be extracted from the data stream, which a DDC like the Matrix excels at).
-Synergy: The Uptone Audio USB Regen already helps clean the USB signal before the Matrix unit. Adding the Matrix further refines the clocking and isolation, which is the exact function needed to potentially enhance PRaT.
In audio, the best results often come from separating the tasks of signal regeneration/isolation (Uptone Audio USB Regen), digital-to-digital conversion and reclocking (Matrix Audio X-SPDIF 2), and digital-to-analog conversion (Musical Fidelity MX-DAC) into dedicated components, as is done in option (b)."
書込番号：26399237
0点
28/01/2026
My Simpler Computer Audio System (Revised):
PC (Windows 11 25H2; USB OUT) >> Musical Fidelity V90-DAC (USB IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
-------------------------------
Musical Fidelity MX-DAC vs. Musical Fidelity V90-DAC を A/B 徹底比較試聴したが、音楽的に後者の方が優れていることが確認出来た。この結果は別に驚くことでは非ず。
また、
-UpTone AUDIO USB REGEN;
-Schiit Audio Eitr
も拙宅の Computer Audio Path に導入するか否かはそれらの徹底試聴の結果に依存するのは言うまでもない。
（続く）
書込番号：26399800
0点
30/01/2026
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> iFi Audio Gold Bar (USB IN/HP OUT) >> Sennheiser IE 800 Earphones
において手持ちの 4 iFi Audio Gold Bars の最終選別作業に入った。
先ずそれら4機の中で別格 (Reference Sample) であるものが1機含まれていることが確認出来たので、今後は残り3機の順位付けをする必要がある。その結果として下位2機は断捨離箱行きである。
（続く）
書込番号：26401582
0点
31/01/2026
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> iFi Audio Gold Bar (USB IN/HP OUT) >> Sennheiser IE 800 Earphones
において残り3機の iFi Audio Gold Bars であるが、非常に優秀な Sennheiser IE 800 に対してはそれら3機すべてが非力過ぎるためにそれらの間に優劣が付きにくい。その理由は Dongle DAC/HPA の性能の限界であるということであろう。
ということで、Earphones を IE 800 から IE 80 に変更して、
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> iFi Audio Gold Bar (USB IN/HP OUT) >> Sennheiser IE 80 Earphones
においてそれら3機の優劣を付けることにした。
なお、本日 Schiit Audio Eitr DDC WITH AC POWER ADAPTER が無事拙宅に届いた。それの試聴は明日以降の予定である。
（続く）
書込番号：26402626
0点
02/02/2026
(A) PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) w/Schiit Audio Power Adapter (120VAC to 6VAC/2000mA) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
(B) PC (HP; Windows 11 25H2; USB OUT) >> Schiit Audio Eitr DDC (USB IN/COAX OUT) w/Schiit Audio Power Adapter (120VAC to 6VAC/2000mA) >> Musical Fidelity V90-DAC (COAX IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
上記の両方の Signal Path にて試聴を開始した。第一印象は両方ともかなり Negative である。
ということで今後の進展を注意深く見守る必要がある。
（続く）
書込番号：26403652
0点
02/02/2026
本日午前中にもう一つの Schiit Audio Eitr w/Power Adapter (120VAC to 6VAC/1500mA) が拙宅に無事届いたので、そのユニットも試聴対象に加えた。
しかし、残念ながら前述の (A), (B) において PRaT, Micro-Dynamics の観点からその欠如が明らかに知覚された。
ということで、誠に残念ながら Schiit Audio Eitr 2機は断捨離箱に向かうことになった。
(Reference Signal Path)
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> Musical Fidelity V90-DAC (USB IN/RCA OUT) >> Townshend Audio Allegri+ Passive Preamplifier (RCA IN/RCA OUT) >> NAD D 3020 V2 Integrated Amplifier (RCA IN/SP OUT) >> Fontek Research C4 Coupler (SP IN/HP OUT) >> Fontek Research A-4 Electrostatic Headphones
書込番号：26404270
0点
03/02/2026
＞ということで、誠に残念ながら Schiit Audio Eitr 2機は断捨離箱に向かうことになった。
それらを断捨離箱に送る前にそれらと、手持ちの Matrix Audio X-SPDIF 2 DDC との A/B 比較試聴を実施してみることにする。
まあ、Schiit Audio Eitr も多分中国製造であろうから実質的には Chi-fi gear の間の対決 (Schiit Audio vs. Matrix Audio) である。
（続く）
書込番号：26404561
0点
03/02/2026
USB-to-spdif converter (DDC) はやはり出費を覚悟しないといけないことを痛感した。その辺の廉価品では負の結果しか得られぬ。また、このトピックに対しては My Google AI も嘘ばかりで殆ど役に立たない。
で、話は元に戻るが、
-ABBAS Audio USB-to-spdif converter (Ukraine);
-Audiophilleo2 MKII + Audiophilleo PurePower MKII in Gold (US);
-Berkeley Audio Design Alpha USB Series 2 (US).
クラスの製品が必要なのであろう。
といっても、 ABBAS は常に入手困難性が付きまとい、Audiophilleo2 MKII では Windows 11 Version 25H2 の環境下での動作不確実性がある。その環境下で動作が保証されているものとしては Berkeley Audio Design Alpha USB Series 2 ということになる。
ということで拙宅では USB-to-spdif converter (DDC) 導入に関して再び冷却期間を設けることにした。
（続く）
書込番号：26404773
0点
04/02/2026
＞まあ、Schiit Audio Eitr も多分中国製造であろうから実質的には Chi-fi gear の間の対決 (Schiit Audio vs. Matrix Audio) である。
何の事はない。Schiit Audio Eitr の圧勝であった。
過去の一時期に Matrix Audio 社製の DAC および Headphone Amplifiers を所有していたが、いわゆる Matrix Audio House Sound が鼻に付いたのでその後にすべて売却してしまった。
（続く）
書込番号：26405107
0点
06/02/2026
Audiophilleo 社に Audiophilleo2 MK2 等の入手可能性などについてのメールを送ったが未だに返信なし。
この会社は現在でも活動しているのであろうか。
（続く）
書込番号：26406988
0点
07/02/2026
拙宅における2機の Schiit Audio Eitr DDCs の AC/AC Adapters として、
120VAC to 6VAC/1,500mA;
120VAC to 6VAC/2,000mA;
110VAC to 6VAC/3,000mA.
を手元に準備できたので、じっくりと時間をかけてそれらの聴き比べをすることにしよう。
まあ、Schiit Audio 社も「安くても良いものを」のポリシーで製品を製造している会社のひとつなのである意味で好感は持てる。Chi-fi でもないので当分の間は拙宅にて保管することになるであろう。
（続く）
書込番号：26407675
0点
07/02/2026
＞ということで、Earphones を IE 800 から IE 80 に変更して、
PC (HP; Windows 11 25H2; USB OUT) >> UpTone Audio USB REGEN (USB IN/USB OUT) >> iFi Audio Gold Bar (USB IN/HP OUT) >> Sennheiser IE 80 Earphones
においてそれら3機の優劣を付けることにした。
と、意気込んでいたもののその結果はこれら3機はドングリの背比べ状態であることが認しくされた。
もう面倒なのでそれらの順位付けを行うことは止めにした -> 所詮は Dongle DAC/HPA である、多くは期待出来ぬ。
（続く）
書込番号：26407697
0点
07/02/2026
拙宅では急いで YouTubes 試聴をするときのみ Dongle DAC/HPA を活用する。
所詮、Dongle DAC/HPA であるがその中でも少しは真面な iFi Audio Gold Bar を使用している。
実を言えば iFi Audio 製品は大嫌いなのであるのだが、 Gold Bar だけは別である。
（続く）
書込番号：26407956
0点
09/02/2026
＞と、意気込んでいたもののその結果はこれら3機はドングリの背比べ状態であることが認識された。
Update (09/02/2026):
さらに厳密な A/B 比較試聴を徹底させて実施したところ3機のうち1機がわずかに秀でていることが知覚出来た。
残るは下位の2機のみであるので、これらに対してさらなる厳密な A/B 比較試聴を実施予定である。
（続く）
書込番号：26409101
0点
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09/02/2026
Naim Audio Community's Thread:
"Best value piece of Hifi or accessory"
https://community.naimaudio.com/t/best-value-piece-of-hifi-or-accessory/42734
拙宅では "50pcs High Quality Noise Stopper Gold Plated Copper Dust Cap for RCA Jack Female" である。
eBay US 経由で容易に入手出来る。
（続く）
書込番号：26409399
0点
14/02/2026
Naim Audio Community's NEW Thread:
"What do you want from a hi-fi system?"
https://community.naimaudio.com/t/what-do-you-want-from-a-hi-fi-system/43536
拙宅にとってはこの質問は決して難問などではない。"The Musical Truth" が拙宅の回答である。
（続く）
書込番号：26412925
0点
14/02/2026
＞残るは下位の2機のみであるので、これらに対してさらなる厳密な A/B 比較試聴を実施予定である。
PC の USB Output Ports を変えて比較試聴して見たが、両者の差異はほとんどないということが確認出来た。
これで順位付け作業はおしまいである。
今でも愛用している Logitech MX518 Gaming Mouse の動作が最近になって鈍くなって来たので、程度・状態の良好な同種中古品を eBay US 経由で入手することにした。
ついに STAX SRD-7 Mk2 があるオークションにて出品されている。それは動作確認品ということであるが問題は落札金額である。幸運があれば入手は可能かも知れないが果たしてどうであろうか。
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