- Jan 2, 2015
I have a strange problem with playing music via my m9xx, could you help me out?
As I am still waiting for my CIEMs to arrive, I was impatient and wanted to test the m9xx out, I decided to try it with the only headphones I have here, which is Bose QC25. So I connected m9xx to both USB and power outlet (using provided cables), plugged in headphones (using 6.3/3.5mm adapter), fired up settings and selected m9xx USB as the source.
Now the strange part, I can hear music playing, but I cannot hear vocals. For example when listening to Daft Punk "Get Lucky", music is really nice and spacious, but I don't hear anyone singing. Then when I tried to play Armin Van Buuren's SoT, the music was completely distorted. I've also tried Audirvana Plus, Decibel and BitPerfect, all playing DSD64/128, FLAC, ALAC from 44 to 352kHz.
Higher I go, better it sounds - but still unusable. I should also state, that I am using 12 inch MacBook, you know the one with USB-C, while running OS X El Capitan 10.11.2
I read that currently El Capitan has problems with USB DACs, but it was always mostly about not hearing any audible output, or having disconnections, not hearing music without vocals.
What do you think could be the problem? Is it the new MacBook's USB-C and using USB-C to USB adapter, or is it this weird El Capitan DAC support?
I've tried both USB Audio Class 1 and 2, Crossfeed ON and OFF, all DAC filters, running on low and high power modes, but nothing helps.
I could try to ask someone in the office who has MacBook Pro to try it directly with USB 2, but I know for sure that they are also running El Capitan.
I am thinking about booting up some Linux distro, but that wouldn't be a long term solution for me.
Last thing to add, I've also tried basic Apple EarPods, but result was the same.
Thanks guys/gals for any help.
This sounds most like a poorly connected phone jack to me. I've found the strangest subtractive audio glitches with headphones that were slightly loose, including disappearing vocals. Those particular ranges must get filtered out in the weird, cross-contacted state that could happen (or whatever it is, I did no science). Also distortion.
It seems like you know how to trouble-shoot so I think you can figure out what to do, but it may also be a manufacturing error. You'd need to verify if it happens for any headphones in either port, I think.