关于ipad 接USB DAC 的一些资料

asdffx

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本来前几天已经想写一下。忙起来，就不记得了，刚好有人说起，我也发些资料大家share一下。ipad有个配件，可以接USB外设，一般都是接相机，不过其实接音频的东西也很多。不过由于升级4.2后，供电少了，要求就严苛了，不够电的要用USB HUB供电
回到正题。

这里是bechmark比较详细的测试。

http://www.benchmarkmedia.com/di ... solution-audio-dac1

可以播放96khz，无线也支持，这个方便，而且应该是bitperfect
Our tests show that:
•        there is no evidence of signal processing
•        there is no evidence of word-length reduction
•        there is no evidence of sample-rate conversion
•        there is no evidence of data compression
•        it is capable of streaming up to 96 kHz, 24 bits
•        streaming via Wi-Fi is also transparent up to 96 kHz, 24 bits


下面是head-fi的兼容列表，大概结论就是符合USB audio的多数能行，也就是不用手动装驱动，系统自动装的设备。
现在是USB-Audio 1.0规范，以后apple可能会升级USB-Audio 2.0，那么就有可能支持到192khz
http://www.head-fi.org/forum/thread/507559/list-of-dacs-that-work-with-ipad

Confirmed works
- Nuforce uDAC [Skylab, Headphoneaddict, uofmtiger, torcik; BryanP reports too much power error]
- DacMagic [uofmtiger]
- Xitel Pro Hifi-Link [deadie]
- Predator [jc9394, HeadphoneAddict] (have to put the volume to 100%)
- iBasso D4 [Headphoneaddict (see post #59)]
- iBasso D1 [trickywombat]
- iBasso D3 [hypoicon]
- iBasso D10 [qusp - doesn't work; HeadphoneAddict (see post #59), rhw - works (charging off)]
- iBasso D12 [dsissitka]
- Pico DAC [Headphoneaddict, warp08]
- Micro II usb/digital [kredmore]
- Headroom Total BitHead [qin]
- Headroom Desktop Portable amp w/DAC [muski]
- TTVJ Portable w/DAC [grawk]
- TTVJ Slim DAC/Amp [gopack87]
- Fiio E7 [Jack-Micca, feiao]
- C&C F1U USB DAC/Amp [phytonix]
- Meier Corda Symphony DAC/Amp [Noumenon]
- Little Dot Dac1 [uofmtiger]
- devilsound v2.1 dac [decur]
- Music Hall DAC 25.2 [Skylab]
- Vivid Technologies V1 USB DAC HD AMP [ccklone]
- Valab NOS USB DAC [ccklone]
- Aune USB DAC/AMP [ccklone]
- Sigtone h1 - without any trouble [rhw]
- USB monica NOS DAC - no problems [rhw]
- DACport (works after flash update, needs external power plugged in) [HeadphoneAddict, shigzeo]
- HA Info NG Coax USB to SPDIF Converter [rhw]
- maverick audio D1 [Mavwong]
- Keces DA-151 USB DAC [maogua]
- Hot Audio DAC Extasy (plug USB cable into DAC and Camera Kit First, then into iPad) [grokit]
- HA NG98 [roymor]
- Firestone Libby (headphone amp) and DAC [shigzeo]
- Firestone Rubby (power amp) and DAC [shigzeo]
- Musical Fildelity V-DAC [Dwaalspoor98]
- Buffalo32S [erd]
- Headroom Desktop Amp [Durandal]
- PS Audio DAC Link III [DjAmTraX]
- Little Dot DAC mk II [alysony]
- 3MOVE [HeadphoneAddict - see post 59 for instructions]
- XM5 [HeadphoneAddict - see post 59 for instructions]
- Vivid Audio Tech V1 [HeadphoneAddict]
- nuForce Icon Mobile [yukster doesn't work; HeadphoneAddict - works, see post #59 for instructions]
- Beresford 7520 [Bazzman]
- Project USB Box [Bazzman]

Issues(?):
- Headphonia DAC cable [qc98, shigzeo - works; utdeep - works but seems "lifeless"]
- PopPulse PCM 1796 DAC [rhw - first an error message, but after reconnection works fine]

Doesn't work
- MobilePre (legacy) [porieux]
- iQube V2 portable [Skylab]
- Yulong D100 home DAC [Skylab]
- PWD [jc9394]
- uDAC-2 [headphoneaddict]
- Hot Audio DAC-Extacy USB DAC [ccklone - dialog box;too much power]
- M2 Hiface USB stick [ccklone - not really a DAC, but didn't work feeding a "known good" DAC]
- Superpro 707 USB [jankovic]
- Soundprime de-jitter box/DAC (24/96) [shigzeo; WORKS with iOS 4.2! - shigzeo]


更新支持：（谢谢国内发烧友提供）
MDAC5   



[ 本帖最后由 asdffx 于 2011-6-27 13:36 编辑 ]

tedczj

只有ipad啊，其他iphone什么的都不行么？

asdffx

iphone可能要改？
因为Camera Connection Kit 不支持iphone
可以试试数据线 加 母到母街头然后接DAC试试看
因为有个HRT iStreamer是那样设计的

szlf619

好东西

耳机大家烧

是这个数码相机套件吗？

激光鼠

这时候就体现出USB Audio规范的意义了

asdffx

原帖由 耳机大家烧 于 2011-6-26 10:14 发表 [url=]http://bbs.headphoneclub.com/redirect.php?goto=findpost&pid=2092826&ptid=161817][/url][/url]http://image.le724.com/Upload/ProductImages/320X240/300/300001/300001666.jpg是这个数码相机套件吗？

是的，其实就USB那个就可以，我试过山寨的X合一也可以用，淘宝上很多，几十块的样子。不过不保证兼容性。

小白

这个配件,拍个实物图看看?

asdffx

http://s.taobao.com/search?q=ipa ... mp;rt=1309060835081

一大堆，原厂贵点，山寨也可以。
这样玩主要方便。就不用PC了。

asdffx

一些图grace 要外界电源加usb hub

asdffx

iOS的系统本来效率也很好，软件运行也类似独占模式，而且还是电池可续航10小时，全铝机箱也很能抗干扰，用来替代复杂的pc也不错。
是了，这个播放时候最好能光掉wifi，蓝牙，和是3g的，把3g也关了，之前有人测试过iphone的音频输出也会受到这些信号的影响。

或者以后就叫ipad hifi吧

[ 本帖最后由 asdffx 于 2011-6-26 12:19 编辑 ]

小白

时尚意义大于HI-FI意义了. M903也根本推不好HD800.

asdffx

图是其他人的，代替pc，我感觉可能会有优势，等别人出报告吧，我没有高档的USB DAC，不清楚能不能hifi。不过一般使用的确不错。

小白

说老实话连我都心动 ...... 即使不能hi-fi,反正肯定比iPad直推耳机强多了. hi-fi和时尚结合,威力无比啊.

guts

我用flac player这个app。好像只有ipad支援24/96，iphone和itouch会自动down sample到16/44。用camera kit有一个问题，就是jitter非常凶猛。外接解码器需要非常强大的异同步usb功能才能较好的播放。一开始我也用这个，后来主要还是用来传照片了。播放ipad音频数据是还是用cla solo，因为本身异同步传输抑制jitter，还可以走同轴出解码器，声音质量比camera kit提高很多。楼主可以试试。用ipod或ipad代替pc有优势，系统简单高效，供电干净，便携。劣势是播放器的可调整空间小，ipod不支援24/96。不过慢慢的对应ipad和iphone的专业播放器越来越多，值得期待。

[ 本帖最后由 guts 于 2011-6-26 12:42 编辑 ]