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Ketil
22
Feb 25, 2016
Have any of you guys experience with a Linux dist with support for the m9xx? When I attach it to my Debian desktop it is only registered as a analog device, not digital. Daphile looks really nice as a dist, but il have to wait and see if it will work after I'm finished getting the 200mb.
I know the way to go for most people is windows and foobar2000, but I haven't been using Windows since 2006, so some recommendations would be whole heartedly welcome.
Product is amazing by the way, my HD 380 pro and beyerdynamic 1350 CC really loves it. Now I can't wait to get my th-x00 shortly (:
CalebRoberts
56
Feb 25, 2016
KetilHi Ketil, I've tested all of our USB audio products with Ubuntu. I can't remember which version I'm using for Dante development - not the latest but 12.XXX LTS I think. m9xx is recognized and operates when it is set to USB 2, I can't remember what the OS does when m9xx is set to USB 1. The default player app doesn't seem to want to change the sampling frequency of the device - but instead it re-samples other FS audio files to 44.1kHz. I haven't spent any time trying to find other player apps or to figure out whether the default player can be configured to send the raw audio data. I don't follow what you're writing about m9xx being recognized as an "analog device, not digital". It's typical that the OS might indicate to the user that the device is a "speaker" or "headphones". The USB descriptors indicate that the device (m9xx) has an input terminal that consumers 32-bit PCM samples and an output terminal that is an analog output. I'm guessing that your OS is indicating the output terminal as per the m9xx USB descriptors. Have you been able to play audio from the m9xx with your OS? m9xxx set to USB 1 or UBS 2?
Hagene
3
Feb 26, 2016
CalebRobertsGot my m9xx today. I'm using it with elementary (ubuntu based). And as far as I know the only way to change the bit rate and sample rate is to go into the pulse audio's config files and change the values manually (remember to remove the ";" infront of the value you changed from default. Thats what I did with my previous dac at least to get it to 24 bit. Not done the 32 bit change yet. Once you have done that you do the commands pulseaudio -k, then pulseaudio --check, pulseaudio --start. Should work(unless your using "Alsa" or what its called). Mine also showed up as both digital and analog, swapped between them and they sound the same so I dunno whats going on with that.
I also got a stupid question, that probably has been answered before. I thought it was suppose to have a low and high power mode when you plugged in the seconds USB connector. But it doesn't seem to have any effect. Both my phone through USB C to micro B on the m9xx and my computers usb ports seems to power the amp just fine alone to around volume 85 (and to 99, not done any listeting on that volume tho since its too loud) which seems good (w/ AKG k712). I can't hear any distortion or anything.
Does that mean I'm under the low power limit, or does it mean its sucking more than 5v 500ma from the USB off my phone / pc, or am I under the low power limit with my k712 around 80-90% volume?
CalebRoberts
56
Feb 26, 2016
HageneIt's interesting to see the number of m9xx users who are working with various linux adaptations. It seems that the hi-res apps are less mature than for Windows or OSX but I'm sure they'll come along. I had an Auralic Aries that is an embedded linux device. It somehow handles all FS and DSD options seamlessly. There might be some benefit to looking into what they are doing.
m9xx High Power mode: If you connect power to the 5V 2.0A jack before connecting to a USB host, the m9xx will only draw current from the 5V 2.0A source - no current will be drawn from the host. This is so that you can use your portable device as host and not draw its battery down. 500mA is the limit that a USB 2 device may draw per the USB 2 specification. If there is a power source connected to the 5V 2.0A jack (regardless of connection sequence), the analog circuits' power supply is higher voltage than if power is supplied only through the USB 2 port. Also, current is limited to 500mA through the USB 2 port but the 2.0A port of course can draw up to 2 amps. Whether you're connected in High Power mode or not won't necessarily make any difference in performance. Yes, the higher voltage makes about a 4.5dB increase in maximum voltage output. That probably makes no practical difference unless you're driving very high impedance headphones that need large voltage to reach desired SPL. However, if you have a heavy load (low impedance, low efficiency headphones, loudspeakers), it's possible that you may be approaching the limit of current that the m9xx can deliver with only a 500mA source. With a 2 amp source, the m9xx can deliver a lot more current. But, that greater capability may not make a difference if your load does not demand it.
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