SD Card Player

hkborn

這幾個月試了不同的數碼播放工具，包括

CDtransport/CD player
電腦
SD Card player

當中，效果最好的是SD Card player。
從技術層面上講，數碼播放最重要的是將數碼檔案完整的轉換為模擬訊號(digital analog conversion)。數碼檔案由0與1組成，所以準繩度很高，問題在於將檔案由儲存傳送至模擬轉換的過程中所產生的差異，從而影響音訊還原的質素。
首先時間的影響最大。一組三分鐘的音樂，如果用一分鐘的時間播放，音樂就不成樣子了。如果用三分鐘去播放，效果就正常得多。可是，要正確無誤的重播，時間單位的要求不只是分鐘，就算是微秒也是一種差異，當然，愈準備的鐘，重播效果愈佳。世界上沒有相同的鐘，就算天文台的鐘也要不時調整。
其次是電流在檔案傳送的影響。乾淨電源、穩定電流是數碼音樂的基礎。
回頭說CDplayer，其存在最大的問題是機芯震動，這也是為什麼Linn放棄CD，改用Linn DS。
電腦作音源的問題在燥音、震動、污染電源，對音質影響甚大。
對SDCard player 的興趣源於一個DIY project
http://www.diyaudio.com/forums/d ... nsport-project.html
由最初16bit/48KHz wav file 到最新PCM／DSD，呢個project 花咗兩個日本仔Bunpei同 Chiaki好多心機。
http://www.chiaki.cc/Transport/sdtrans192.html
既然網上評價咁高，小弟向Bunpei訂咗一件，後來先知佢地限量制作，非常搶手，而家一機難求。花咗成五千蚊，收到時戰戰競競，因為好易燒壞，正負極要正確，後來唔小心插錯9volt電，咁就燒了線路板，要寄返日本修理。



（待續）

hkborn

講番呢塊sdtrans384，用bnc可以播24／192，用i2s可以播PCM同DXD。小弟暫時剩係播16/44.1嘅CD red book format。未用sdtrans384之前，用過嘅播放器有
Mac book Pro
PC windows 7
Linux
Voyage MPD
Linn Akurate
Sonos
Logitech Squeezebox touch
CD Pro2
當中最好嘅係linux
用sdtrans384嘅感覺係秒殺之前嘅播放器。。。
於是，小弟花上好多時間去搵有關資料，瞭解到用SD card嘅好處。跟住俾我搵到原來強國都有sd card player.價錢仲係幾舊水。

jtt

係咪QA-550 WAV?
http://www.qlshifi.com/wzcp/QA550.htm

Media player type 的 Music player概念係最好, 最簡單直接少干擾, 但實際上出來質數又係另一回事
以前數字台有人講過,
mod 咗個Clock, 又用linear power supply / Battery power supply, 都輸transporter,
e 家班人轉咗玩USB DAC

MSB 個DAC 都可以直接Read USB 手指, 唔經電腦 / NAS / Router,
但有report 都係話唔及其他input

奇怪在Media player type 的 Music player 埋論上最少干擾 (唔經電腦 / NAS /Router), 應該最好,
但各大廠商都係生產 要經NAS / Router streaming 的 music server, 又或者要駁電腦的 USB/Firewire DAC, 都出唔到部好質素的Media player type  Music player, 當中一定有d 原因

如要近似Media player type  Music player,
簡簡單單, ipod /  iphone + digital signal output docking,
可以試吓到底有幾好聲............

raykkc

我用開blacknote 部DSS30手指Player同一概念，也秒剎了部三萬元CD機

raykkc

我用開blacknote 部DSS30手指Player同一概念，也秒剎了部三萬元CD機

hkborn

jtt 發表於 2012-7-26 22:01
係咪QA-550 WAV?
http://www.qlshifi.com/wzcp/QA550.htm

yes, it's QA550, I didn't do modification but the sound quality is extremely good, well above my expectation.
I just use a cheap DAC, but the sound is better than expensive CD player, this is confirmed by quite a number of experienced audiophile.  

jtt

hkborn 發表於 2012-7-26 23:06
yes, it's QA550, I didn't do modification but the sound quality is extremely good, well above my e ...

睇吓夾咩DAC, 平平地玩, 係殺得低一d CD Player (部QA550 mod 咗Clock, 改做BNC output, 行返75ohm, 用Linear / Battery power supply)

但同其他一些認真setup 的 Streaming CAS / USB&Firewire + Computer CAS, 仍有不少距離.

"用sdtrans384嘅感覺係秒殺之前嘅播放器"
可否分享那些播放器是否有認真setup, 配置到底是什麼而得出此結論?

就如你提過的Linn Akurate,
用不同Lan cable, 有冇用 LAN Filter, Router/NAS 改用Linear Power, NAS 入面用SSD/HDD,d 聲都可以差幾遠

hkborn

I like using basic set up, so comparison is apple to apple.
Commercial music servers are highly overpriced..
"但同其他一些認真setup 的 Streaming CAS / USB&Firewire + Computer CAS, 仍有不少距離."
I don't quite agree...

jtt

hkborn 發表於 2012-7-26 23:38
I like using basic set up, so comparison is apple to apple.
Commercial music servers are highly over ...

比力一定得

都係一個不錯的入門方法!

hkborn

one of the listener is a member of Hong Kong Chinese Orchestra, when listening to Chinese instrument, he said that it's very close to live performance

jtt

hkborn 發表於 2012-7-27 00:09
one of the listener is a member of Hong Kong Chinese Orchestra, when listening to Chinese instrument ...

Hiendy 應該搞個 SD Player v.s. CD 機/ 電腦CAS / Streaming CAS
等大家都可以平靚正咁玩hifi ~

hkborn

QA550 only costs RMB600, worth trying. order from taobao and have a try b4 spending huge money on cd transport or music server

k500a

jtt 發表於 2012-7-26 22:01
係咪QA-550 WAV?
http://www.qlshifi.com/wzcp/QA550.htm

謝謝分享。
真的有廠出USB stick DAC player:
http://www.constellationaudio.com/ca/performance/cygnus
不過也是天價產品。
設計師是Playback Design的老細。

jtt

k500a 發表於 2012-7-27 00:45
謝謝分享。
真的有廠出USB stick DAC player:
http://www.constellationaudio.com/ca/performance/cygnus ...

Also, Naim DAC can play file from USB Drive
http://www.naimaudio.com/hifi-products/pdt-type/150

raykkc

http://www.6moons.com/audioreviews/blacknote/blacknote.html

我用呢部

raykkc

http://www.6moons.com/audioreviews/blacknote/blacknote.html

我用呢部

hercules

I have a modded qa-550, anyone want to have a trial?

hkborn

hercules 發表於 2012-7-27 20:44
I have a modded qa-550, anyone want to have a trial?

What's your comment?

ccso

hercules 發表於 2012-7-27 20:44
I have a modded qa-550, anyone want to have a trial?

Hercules hing, I would like to have a trial ~