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Old 27th March 2013, 11:54 PM   #121
qusp is offline qusp  Australia
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UAC2 is also multichannel
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Old 28th March 2013, 12:11 AM   #122
phofman is offline phofman  Czech Republic
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Just like UAC1. Here are altsettings (available configurations) of a dirt cheap (1.20 USD incl. shipping to Europe ) UAC1 8 channel sound card with 6 analog out plus 2ch SPDIF out:

Code:
pavel@eeepc:~$ cat /proc/asound/card1/stream0 
USB Sound Device         at usb-0000:00:1d.1-1, full speed : USB Audio

Playback:
  Status: Stop
  Interface 1
    Altset 1
    Format: S16_LE
    Channels: 8
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
  Interface 1
    Altset 2
    Format: S16_LE
    Channels: 2
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
  Interface 1
    Altset 3
    Format: S16_LE
    Channels: 4
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
  Interface 1
    Altset 4
    Format: S16_LE
    Channels: 6
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
  Interface 1
    Altset 5
    Format: S16_LE
    Channels: 2
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 96000

Capture:
  Status: Stop
  Interface 2
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 5 IN (ASYNC)
    Rates: 44100, 48000
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Old 28th March 2013, 12:17 AM   #123
qusp is offline qusp  Australia
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i'd like to see the audio quality you get 8 channels on USB full speed...

scratch that, I know what it was like, 8 channel 16bit is a bit pointless too, mixing and any sort of digital volume in 16bit is a waste of time. of course I suppose there would be the odd device that could handle USB2 with UAC1, but doing any sort of multichannel playback or recording was problematic at best without custom drivers before UAC2. hardly anyone took it (USB audio with native drivers) seriously in pro audio. it was all firewire, PCI or custom USB

Last edited by qusp; 28th March 2013 at 12:31 AM.
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Old 28th March 2013, 12:39 AM   #124
phofman is offline phofman  Czech Republic
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You have it all listed in the altset specification - 16bit, 44100/48000Hz. The typical standard for adaptive USB soundcards.

It handles full 8 channels easily without any bit loss. Maximum high-speed isochronous payload is 1023 bytes each 1ms, safely above the 8 x 2 x 48 = 768 bytes used. I could show the usb payload with wireshark but we would see only identically sized URBs. I have tested that multiple times before.

The actual sound quality is actually surprisingly decent considering it is a dirt cheap compromised device. It even has toslink input which actually works too
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Old 28th March 2013, 12:46 AM   #125
phofman is offline phofman  Czech Republic
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Multichannel is for movies and that has been until recently 48/16 exclusively. Pro use is a different story, of course. I am talking about a card priced at bigmac levels.

Well, actually the ebay sales person miscalculated the price, it is selling at 13 USD now
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Old 28th March 2013, 01:38 AM   #126
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Quote:
Originally Posted by phofman View Post
1.20 USD incl. shipping to Europe
Did it come with a cable? :-)
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Old 28th March 2013, 05:44 AM   #127
qusp is offline qusp  Australia
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Quote:
Originally Posted by phofman View Post
You have it all listed in the altset specification - 16bit, 44100/48000Hz. The typical standard for adaptive USB soundcards.

It handles full 8 channels easily without any bit loss. Maximum high-speed isochronous payload is 1023 bytes each 1ms, safely above the 8 x 2 x 48 = 768 bytes used. I could show the usb payload with wireshark but we would see only identically sized URBs. I have tested that multiple times before.

The actual sound quality is actually surprisingly decent considering it is a dirt cheap compromised device. It even has toslink input which actually works too
above listed it as logged as a full speed device, is that a typo mentioning high speed? edit: nvm I was thinking low band (1.5Mbit)/high band(12MBit)

provided its the only thing on the bus it should work at 16 bit I guess, I only know 24bit was glitchy and 16bit pointless for an audio interface, so would never have tried it, but you just illustrated that point pretty well so i'll not argue

Last edited by qusp; 28th March 2013 at 05:51 AM.
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Old 12th April 2013, 06:45 PM   #128
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Thanks for share your topic which is USB cable quality. Everyday we are using a lots of Electronics substance where needs a lot of USB cable for various purposes. From above topics now I am know about what are the quality a good USB cable. This topics help me a lot. Now I am using USB3 cable for my PC. But sometime this doesn't work like as when I put a pendrive It show taht this is not recognize..Please tell me what should I do now?????I am waiting for your answer.......Thanks
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Old 28th August 2013, 02:04 PM   #129
Starre is offline Starre  Sweden
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Default Listening?

A lot of theory here, but have you really listened and compared different USB cables? I have compared 4, from a few dollars to 1500 and the all sound different.
The cheap standard one: very good reproduction of space, but rather unclean and somewhat tiring to listen to. I did not want to keep that cable in my system although on some recordings it was good.
The other ones from 100 dollars to 1500: Here it is all a lot smoother in sound but I miss some space and depth in the recordings. The 1500 one was the most natural sounding and best timing, but I still miss some of the space and detail the cheapest cable gave. Too bad the cheap one had so many other "problems".
Bottom line: I have not found my ideal USB cable yet, still looking. And no doubt it sounds different with different cables when I listen. .
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Old 28th August 2013, 02:23 PM   #130
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by Starre View Post
And no doubt it sounds different with different cables when I listen. .
No doubts = confirmed by blind listening test by you?
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