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Post by linicks on Apr 28, 2011 11:42:19 GMT -5
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Post by roadrunner on Apr 28, 2011 12:55:23 GMT -5
Nick, thanks for the links for setting up the drivers for Windows 7. During my conversations with Eric, at Emotiva, he has said that the XDA-1 does not do any down sampling nor any upsampling. It will only process exactly what is fed to it. Eric also said the USB on the XDA-1 is capable of handling 24/192 signals and has been bench tested to verify this. It only requires that drivers and software be properly setup. Perhaps the links you have provided will help guide those users wanting to use Hi-Res files via the USB connector.
Eric is the Emotiva engineer primarily responsible for the XDA-1. I suggest that anyone wanting clarification on anything dealing with the XDA-1 contact Eric for his assistance.
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Post by linicks on Apr 28, 2011 15:15:11 GMT -5
Nick, thanks for the links for setting up the drivers for Windows 7. During my conversations with Eric, at Emotiva, he has said that the XDA-1 does not do any down sampling nor any upsampling. It will only process exactly what is fed to it. Eric also said the USB on the XDA-1 is capable of handling 24/192 signals and has been bench tested to verify this. It only requires that drivers and software be properly setup. Perhaps the links you have provided will help guide those users wanting to use Hi-Res files via the USB connector. Eric is the Emotiva engineer primarily responsible for the XDA-1. I suggest that anyone wanting clarification on anything dealing with the XDA-1 contact Eric for his assistance. Roadrunner, Thanks for this clarification about the hardware! The Emotiva website, and owners manual are currently pretty vague when it comes to the USB specification. -- Nick Pavlica |
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Post by linicks on Apr 28, 2011 15:50:31 GMT -5
Here is a quick tip for Ubuntu Linux users. Newer versions of Ubuntu are using the pulse audio server, and it's set to 16 bits and a sample rate of 44100 by default. You can test your audio interface with this command to see how it's currently configured (adjust this according to your hardware, etc.):
Test Settings Example (From a terminal window/shell):
- Note: You should be playing audio when you do this.
$ sudo cat /proc/asound/card0/pcm0p/sub0/hw_params
[sudo] password for you:
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 192000 (192000/1)
period_size: 192000
buffer_size: 384000
You can see in this example that I have the sample rate set to 192, the max that the Audio server and my hardware will support.
You can change this configuration by editing the pulse audio configuration file.
Example (From a terminal window/shell):
$ sudo gedit /etc/pulse/daemon.conf
and adjust the following:
; default-sample-format = s16le
; default-sample-rate = 44100
To your needed/desired bit & sample rate:
default-sample-format = s32le
default-sample-rate = 192000
Note: Make sure you are familiar with the capabilities of your hardware so that you know what settings to use. If the sound doesn't work, re-adjust the settings or restore the default settings. Also, setting these to a higher bit/sample rate will increase your CPU utilization slightly because it pads lower bit/sample rate streams with 0's, but it hasn't been an issue for me.
Save the file and restart pulse audio, or restart the computer which ever you are more comfortable with, re-test, and enjoy!
-- Nick Pavlica
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Post by ultramic on Apr 28, 2011 18:59:46 GMT -5
Just to clarify, the thread started off by saying the USB on the XDA-1 could only output at 16/48 and now we have confirmation it can do 24/192 subject to correct configuration and drivers - is this correct ?
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Post by GMan on Apr 28, 2011 19:11:43 GMT -5
The XDA-1 is a USB 1.1 device. It cannot do 24/192.
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Post by ultramic on Apr 29, 2011 2:04:08 GMT -5
The XDA-1 is a USB 1.1 device. It cannot do 24/192. This goes against what Emotiva said - apparently they confirmed the USB on the XDA-1 is capable of 24/192. We need to get this clarified. |
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Post by jefffree69 on Apr 29, 2011 10:03:00 GMT -5
OK we're getting somewhere now! but I'm still not sure exactly where.  Despite all good intentions it seems at least one poster is wrong (maybe both?). I'm almost ready to believe that XDA-1 can do 24 / 88.2 (and 96khz) over USB, and that any USB-1 PC with an appropriate software player can drive it. BTW HDTracks has a 10 % site-wide sale this weekend.... |
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Post by GMan on Apr 29, 2011 11:18:02 GMT -5
The XDA-1 uses the CM108AH USB 1.1 chipset. The Product Description says it is "Compliant with USB Audio Device Class Specification v1.0". You need USB Audio Class Spec v2.0 to handle 24/192. You can confirm it for yourself by plugging it into any Windows PC. Windows detects it as a USB 1.1 device. |
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