piCorePlayer6.1.0-Xenomai-44.1-48KHz雙機入門簡易安裝教學

[seeteeyou]

由於百萬兄的 Compute Module 4 專用子板並無 GPIO，因此 FifoPi 的用家就需要增添 Ericcatz 兄介紹的 BridgePi 和 Amanero384 子板後才可以成功連接到 FifoPi：

https://www.mobile01.com/topicdetail...&p=47#81702780

但是 Amanero384 於 latency 方面實在是慘不忍睹：

https://www.whatsbestforum.com/threa...69#post-718858

As an avid longtime owner of the Chord DAVE DAC, I have enviously watched Lampizator Pacific owners surgically bypass the horribly high-latency Amanero USB chipset that came installed on their DAC courtesy of the JL Sounds XMOS board. It turns out that bypassing the Amanero bottleneck leads to what Emile describes as improved "boogie."

幸好還有 I2SoverUSB 這個選擇：

http://jlsounds.com/i2soverusb.html
https://www.ebay.com/itm/113877290673
https://audiophilestyle.com/forums/t...omment-1132597

Hi John,

Our I2SoverUSB board is not directly made to swap with Amanero, so the wiring will be different :) but it's straight forward.
We have Amanero styled board - but we need to do some more tests of it - possibly next week.

Best,
Lyuben

https://www.diyaudio.com/forums/digi...ml#post6374666
https://www.diyaudio.com/forums/digi...ml#post6366228

Best sound quality I have found is either I2SoverUSB or the latest Chinese USB board with Accusilicon clocks.

https://www.diyaudio.com/forums/digi...ml#post6373052

You see, I am not theorizing. I bought several (well, more than several) USB boards to evaluate. Same for dac boards. Reverse engineer most of them, sketching out circuits from following traces and ringing out connections with a meter. Many listening tests performed too. After enough time and effort invested, one gets to know a lot about how dacs, USB boards, etc. are designed just by looking at at pictures of them.

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另外最近還找到這調較 piCorePlayer 音質的東西：

https://github.com/dynobot/TinyCore-Sound-Adjustments
http://www.hdvietnam.com/threads/ras...#post-10558149
https://www.diyaudio.com/forums/pc-b...o-quad-40.html

好像是跟 soundcheck 兄的 tuning kit 有些分別？

https://github.com/klslz/tuningkitpcp

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https://item.taobao.com/item.htm?id=643286972960

如需自己外接54MHZ時鐘輸入，請聯繫店主要求增加SMA插座

最後就是關於百萬兄的 Compute Module 4 專用子板，假如有計劃外接 OCXO 時鐘，50Ω 的 SMA 母座會限制了線材方面的選擇，質素方面也不是那麼好，因此建議改為 75Ω 的 Canare 12G-SDI BNC 母座：

https://www.canare.co.jp/products/co...hp?tid=pr2_006
http://www.canare.com/ProductItemDis...ductItemID=249

畢竟連接時鐘的 75Ω 線材越短越好，那麼用好一點的線材也不打緊了，5N 純銀線的話可以考慮 Oyaide FTVS-510 切售線：

https://shop.oyaide.com/products/p-1792.html
http://www.oyaide.com/ja/products/au...cable/ftvs-510
http://www.oyaide.com/ENGLISH/AUDIO/...ual/pg526.html

或者萬隆 NEVD-2001II 純銀切售線：

https://www.pcstore.com.tw/ar_audio/M47814702.htm
https://www.ruten.com.tw/item/show?21834526587821
https://www.vhaudio.com/neotech-nevd-2001.html
https://www.partsconnexion.com/NEOTECH-77923.html
http://www.soniccraft.com/product_in...vd-2001-p-1561
https://www.hificollective.co.uk/cat...nevd-2001.html

當然 12G-SDI 級數的切售線或許會更理想？

https://www.markertek.com/product/l-...black-per-foot
https://www.canare-tomoca.jp/shopdetail/000000001555

成品線如下：

https://www.bhphotovideo.com/c/produ...di_4k_uhd.html
https://www.markertek.com/product/l8...e-cable-3-foot
https://probroadcastsupply.com/laird...l8cuhd-b-b-003
http://www.lairddigitalcinema.com/Pr...dClass=VBNCBNC