- #1 [batmanamesIA], 17-06-26 23:01如題
- #2 [T.K.T], 17-06-26 23:19
黑膠 - #3 [pluto2], 17-06-26 23:27DIY的commercial方面很熱鬧呀(^V^),如這:
-SD card memory + simple data retrieval logics -> no PC!
-sync'd by ess 9038 dac chip
- with NDK duculon clock -world's lowest jitter clock (at freqs in use)
- rest in photo: power supplies
- Heard it at MJ audio festival in March 2017. (^V^)
- Sound? hint: Its Stig Bjorge of Lyra Cartridge's favorite, over and ahead of his emms Labs transport + dac.
CFT
最後修改時間: 2017-06-26 23:43:21 -
- #4 [pluto2], 17-06-26 23:32Or this MJ magazine hirez player using usb memory as data source, again no PC!
i2s or headphone/line out.
(^_^)
CFT - #5 [batmanamesIA], 17-06-27 00:15Thanks and good MJ player
- #6 [SAnalogue], 17-06-27 07:15而我就玩全線性供電cas... i7 cpu; windows server 2016
- #7 [whizmika], 17-06-27 08:52SAnalogue兄,如果我咁玩我會將穩壓等外置,我諗你係想接線用得短,但我情願做多少少工夫加屏蔽都唔想影響機內散熱。
- #8 [tmcc2006], 17-06-27 09:03失禮晒剛剛開始玩...-_-”
- #9 [SAnalogue], 17-06-27 09:25whizmika 兄, 外置及內置電源各有各好壞吧 =P
外置可減少零件互相干擾問題
但由過機線所增加的線材, 及接駁插頭...導致的干擾及阻抗亦不卻忽視
而外置電亦需佔用多一個機架空間
而內置最大問題是零件擺放...需大量心思減少零件之間互相干擾...
散熱為其次...只要用多心機測量電壓電流值...數要計算準確
好處當然是接線短..尤其是細電流之組件, 如USB, CLOCK 等...如果線材長極容易受到干擾 - #10 [唐吉訶德], 17-06-27 09:33CAS 越來越進步,只要有好的音樂檔案,就可以盡情享受音樂,簡單好聲!
我樂此不疲,對音樂興趣更濃 - #11 [ck2007], 17-06-27 09:34放低咗年幾, 最近看到有師兄推介Raspberry PI+Volumio, 剛手上有Raspberry PI2, 不用買就試下.
非常好直得用, 方便低成本音質好慳電. usb DAC不用裝driver, 放張micro SD(燒好volumio), 簡單定好audio file 位罝, 之後一開機什麼都不用理, Mon都無駁手機開Apps選歌.
我覺得好聲原因: OS沒有其他工作純播歌Realtime kernel, 無風扇無hard disk只用USB電源.
個人感覺,因為沒有AB比較, 享受中... - #12 [marc], 17-06-27 09:50fusionCAS x Raspberry Pi3 x Runeaudio 好聲享受中...
http://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=103718
最後修改時間: 2017-06-27 09:51:00 - #13 [pluto2], 17-06-27 12:52One proper way to play Pi3 well is...
Put in an isolator board, then add a reclocker board too...afterwards it will really really really sing! (^_^)
Have a look at Allo.com
(Kali is the FIFO reclocker,
the isolator about to release)
CFT
最後修改時間: 2017-06-27 12:56:49 - #14 [fr3d3r1ck], 17-06-27 13:05#13
咁即係疊起有四層樓高?
Pi3
Isolator
Kali reclock
Piano 2.1 - #15 [ck2007], 17-06-27 13:10是慳位方案,未必好声。
现在usb dac已经async我理解已達到reclock效果,有錯请指教. - #16 [fr3d3r1ck], 17-06-27 13:38Kali reclocker 用在pi3同HAT(Hardware attach on top)DAC sound card之間,如果用USB出應該無影響
- #17 [lovebird], 17-06-27 15:16#3
果粒 NDK clock 係超低 jitter 嘅 OCXO,貴過粒 9038 好多,可惜冇 100Mhz,好似唔 support 192k 以上 format,不過我相信比較少人需要咁高 resolution。可以好聲過 EMM Labs 唔奇,我就好想知佢用咩 PLL 嘅方法...
冇用 PC 嘅好處係可以比較容易抑噪,又可以用簡單 d 嘅 dac interface,不過唔知道個 player UI 會唔會簡單化一點,而就算用 PC 我都唔敢隨便加 Choke 加 filter,好容易過了火,另外如果個
media 可以 access 埋 NAS 會全面 d…
DAC 其中最難都係調聲,有機會我都想聽下佢表現… :) - #18 [pluto2], 17-06-27 15:25>#15/16
i2s out, 唔再玩usb:
www.digitalaudioreview.net/2016/05/gordon-rankin-on-why-usb-audio-quality-varies/
其實最好唔用pc lah, too many instructions, thus 多 glitches...
preference:
SD/usb memory > Pi3 > PC
CFT
最後修改時間: 2017-06-27 15:28:23 - #19 [pluto2], 17-06-27 15:33>#17
usd1000 ndk dulucon
384khz, dsd256 ok, using clock multiples.
PLL? No. (^_^)"
simple data access means low jitter. (^_^)
CFT
最後修改時間: 2017-06-27 15:43:39 - #20 [pluto2], 17-06-27 15:50from #18 link: (USB has inherited transmission error issues - therefore performance varies with different PCs)
“The three main USB transmission protocols are Bulk, Interrupt and Isosynchronous. Bulk (used for data transfer to a hard drive) and Interrupt are error correcting. Isosynchronous (used for audio) is not.”
“Bulk and Interrupt are immediately NAK (negative acknowledgement). The receiver is designed to detect a bad packet immediately and the packet is resent.”
“For USB audio, the receiving device is basically translating a serial stream of data with a clock interwoven throughout. At the end of the packet sits some sort of block check. If the block check does not match the data then that packet is flagged as an error.”
“With Isosynchronous USB transmission, packets are sent without any error correction / resending. But guess what? This is the USB protocol used for audio frames. The bad news is they are not error free. The good news is these Isosynchronous frames are afforded the highest priority in the system.”
最後修改時間: 2017-06-27 16:01:25 - 下一頁 (1 of 2)
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