先說一下我的時間,最好的時間是早上到下午2點半以前,恩 其他休假時間大部分都要陪老婆回娘家等等,要她陪著我聽,我看她會不耐煩.
可列印查看
先說一下我的時間,最好的時間是早上到下午2點半以前,恩 其他休假時間大部分都要陪老婆回娘家等等,要她陪著我聽,我看她會不耐煩.
耶....這個周末要陪老婆回娘家,所以沒法參加
=.= 我都是下午到晚上要去公司,一般晚上的時間比較難喬,白天到下午的時間我幾乎每天都OK.
恩 是到下午兩點半左右 .
我白天的时间可以配合,只要不是周二、周四就好。
DAC32 有Mac driver
15號 我OK,但是地址是在??怎聯繫?嗯我用的電腦訊源是win XP呢,還沒升級到win7
那就只好用我的Mac囉~麻煩帶driver過來
tvec呢?那天有空嗎?
地點嘛,喬到雷爾斯音響的門市! http://las-audio.myweb.hinet.net/news.html
那天他們會早點開門。
10/15星期五10:30(可以一直待到晚上8:30)
參加者
io8277 : North Star Essensio
drunkenlife : MacBook Pro, EMU-0404 USB改電池電源, 隔離變壓器(一大二小)
歡迎報名!
空..兩手..也來囉?
不會吧 在汐止...有點暈倒, 我在中壢 =.=, 這樣我會來不及上班.
週五 10:30am ok,我有一台Win7的NB,屆時可以帶去,除了DAC32 driver + Foobar2000外,還需要先裝任何軟體嗎? (我的CAS是Mac Mini,所以Win7 NB沒用在聽音樂)
OK 好吧,到時候打擾囉 .
恩小弟還有個問題 不知道 north star 可否安裝 usb asio?
小弟上網看到有人推薦 USB ASIO剛剛也安裝試用看看,不過卻都一直卡在AUDIO INTERFACE這個畫面呢,不知道是什麼原因,另外請教的是原先是使用ASUS STX不過現在換了DAC,FOOBAR裡面的OUTPUT是顯示KS NORTH STAR DESIGN USB DAC可是 ASIO DEVICE卻還是顯示 ASUS STX這樣是正常的嗎?應該如何處理? 感謝各位大大.
Foobar還要加個plugin,去Foobar網站找就有
KS NORTH STAR DESIGN USB DAC
這行的KS應該是Kernel Streaming,既然有這個,應該就不用再加上ASIO了,可是XP有Kernel Streaming嗎?
Foobar也有個ASIO plugin
更新參加人員及設備
事由:Async USB DAC比較
時間:10/15星期五10:30am至...最晚8:30pm...
地點:雷爾斯音響門市,汐止仁愛路195號,02-26475757,路不熟的先到汐止再打電話問
交通方式:
開車:國道一或三汐止交流道下,轉新台五路,再轉仁愛路,店門口前停車格很多
搭火車:汐止站下車,走四百公尺
搭捷運:南港線昆陽站下,到路對面搭公車藍15,至汐止市公所下車
內湖線南港展覽館站下,搭公車605,至汐止火車站下車
器材:
喇叭LALS Classical 3, Flamenco 2, Flamenco 1
擴大機:Audio Note Kit One綜合,Audio Note 300B前後級, Luxman前後級
參加者:
io8277:North Star Essensio, Windows XP
tvec:North Star DAC32 USB, Windows 7
葉sir
drunkenlife:EMU-0404 USB改電池電源,Mac Book Pro, 隔離變壓器(一大二小)
歡迎報名插花!攜帶DAC更歡迎~晚點到也無妨
恩 對阿最好有AYRE QB-9 WEISS DAC202,之類的,看看彼此的音色差異在哪?
我也是差不多1:30要離開,2:30前要回到土城
期待下對比評測的結果...葉sir和drunkenlife大總結下USB DAC32, essensio, 以及QB-9的聽感對比哈,不勝感激
感謝io8277與tvec二位攜帶Essensio及DAC32千里迢迢在雨天老遠跑到汐止來,
二部同廠牌二個級距的機種的表現,確實沒話說,高級機種在空間感、細節、細膩度上明顯勝出一籌,
但二部都明顯聽的出來jitter都不高,音像都相當穩定,一如預期async USB DAC會有的優點。
async..原字 asynchronous 發音..ㄟ'辛可諾耳死.
譯為..非同期的..異步的.
可能不少網友對 async usb dac 還不太了解.能者可否簡說明一番..?
今天在下工程忙碌未赴參與..真是唆蕊.
感謝 drunkenlife,還有雷爾斯黃先生ˋ柯先生的招待.恩隔離變壓器真的不是蓋的讓聲音升級許多,另外雷爾斯的落地喇叭,再加上前後級的驅動下,表現真的不輸越點的PCM喇叭.
這篇裡 http://www.computeraudiophile.com/co...B-Audio-Primer
"In Adaptive mode the computer controls the audio transfer rate, and the USB device has to follow along updating the Master Clock (MCLK) every one millisecond. The USB bus runs at 12MHz, which is unrelated to the audio sample rate of any digital audio format (i.e. 44.1K requires a MCLK = 11.2896MHz). Therefore Adaptive Mode USB DACs must derive the critical master audio clock by use of a complex Frequency Synthesizer. Since the computer is handling many tasks at once, the timing of the USB audio transfers has variations. This leads to jitter in the derived clock." Says Wavelength Audio's Gordon Rankin.
也就是說,adaptive mode下,USB DAC由收到的資料量來合成clock,
而在async mode下,則是自己有一個產生clock的石英震盪子,
二者自然會有相當的精準度差異
哎,糟糕...還是漏了拿出io8277的CD...還擺在我的Mac裡...
地址給我吧,寄過去...
又,tvec,sampling rate必須用應用程式下的工具程式裡的 音訊 midi設定
=.= 是漏了哪一片??我沒注意到,請直接幫我寄到我店內的地址 謝謝.
我個人覺得Asynchronous 和 Adaptive 都不能“保證”沒有jitter. Gordon Rankin當然是賣瓜的說瓜甜了.
聽一聽另一家之言
Quote from CEntrance DACport http://www.centrance.com/products/dacport/
Jitter Management - Debunking the Asynchronous Myth
Some manufacturers may lead you to believe that Asynchronous USB transfers are superior to Adaptive USB transfers. This no more true than saying that you "must" hold the fork in your left hand. If you know what you are doing, you will feed yourself with either hand.
The USB argument comes down to jitter management and goes as follows: In Asynchronous mode the device is the clock master. In Adaptive mode, the computer is the clock master. Either way works fine, if correct design principles are followed. Here is the tricky part that often gets omitted: No matter which side is the source of the clock (PC or DAC), the two devices are still connected by the USB cable and the digital data on that USB cable is always irregular because the computer is involved. Computers do many things at once and end up sending data over USB in irregular intervals, no matter who is the clock master on the bus. This irregularity causes jitter. So, there is no jitter-free solution, just like there is no dust-free house. Irregularity always creeps in and needs to be actively managed.
DACport jitter cleanup
Here is where the Asynchronous vs. Adaptive argument breaks down: In either of the two clocking schemes, jitter is present during transmission. It's inevitable and also ok, if it is properly cleaned up prior to the D/A conversion, where it matters most. Neither clocking scheme is superior and both are capable of performing well if you know how to reassemble the bits prior to the DAC. Now, how do you actualy do that? There are many ways, the oldest and simplest of which is buffering. Irregular data comes in, regular data goes out. The most important part is to make sure that samples leaving the buffer on the way to the DAC are clocked accurately. DACport employs JitterGuard™, a proprietary two-stage clock management system that does just that - cleans up the jitter on the USB bus so that samples are virtually jitter-free at the D/A conversion point. The result is a natural response, crisp definition, extra resolution and wide soundstage.
我兩家的東西都沒買(沒預算).
恩 我就我聽過的說說,dac32聲音背景更為寧靜,聲音的空間感更佳,音調的感覺也更為清晰,
而essesio跟dac32比起來聲音感覺悶了一些,不過我認為被KO是剛好.不然dac32會對不起他的身價.
您也許太小看DACport的研發了. |(|-|(|- 看看http://centrance.com/products/ (最下面有一些free download的軟體). 這家公司在Chicago,附近的人材可能比您想像的多不少, Northwest,UIUC,等等.
非也非也...這還是沒搔到癢處...正好講反了...
任何USB傳輸形式都有driver...
async這名字,就擺明了,你丟你的,我丟我的,我不用管你,
因此driver就不用精準控制時間(事實上以PC而言根本就不可能精準)
以PC而言,和轉盤也沒啥關係,現在的ATAPI甚至SATA的buffer都大的嚇人,隨便也是數百K級,一次就從CD ROM讀出那麼一大筆資料,因此無關clock。
若是指CD player,那這句就正確了!這也是為何避震對CD player很重要!
也就是,解決問題,必須由問題的核心去解,正如治病必須治病根,而非表象。
數位問題,就該以數位方式解,
CD player搞成那種又大又重的轉盤手法並非正途,那樣做,只是因為受限於使用現成的chipset,不得已,沒輒,只好由外圍搞work around,
當然不是好方法,當然事半功倍...
那何以不挑最直接且hardware cost最低的async方式做?
而是在後面搞大費周章又花成本的jitter消除?
一個8051 based USB micro controller就能搞定了...甚至不用寫PC上的USB driver
還是像我一樣?不熟USB protocol...又沒時間讀...