The usual level of desktop CD player's Cinch Outs e.g. perfectly fits with Mobius analog input.I'm still not sure how they intended the end user to use the 3.5mm cable. You wouldn't want to double amp, so I assume the only "proper" setup with it would be to feed the headphone the output of a DAC running at line level using an RCA to 3.5mm cable or something like that.
Mobius Input's impedance is high enough for a direct connection to line sources, something that doesn't work with unpowered (passive) headphones.
Soundwise Mobius analog input is on par with digital connection.
There is a little misconception in Mobius analog input, as there is no digital gain range after it's fixed level (1.8V RMS for fullscale drive) AD-converter.
So Mobius cannot deal well with weak analog sources.
Mobius analog voltage sensitivity is slightly above that of a Sennheiser HD-800.
It's absolutely legit to use Mobius with a headphone amp, just don't dial it up far above 2V RMS (~6V peak-to-peak) output, or Mobius might break.
To avoid this, set Mobius' volume control to maximum, then set your desired volume with the headphone amp's control.
If there's audible noise then, bring down Mobius' volume control until noise "disappears" and counteract with the headphone amp's volume control, but don't overdo this.
If you do this too far, you will hear distortions and possibly you overdrive Mobius input (with the danger to destroy it), or the headphone amp's output, or both.
Last edited: