[flyfish2002]

I know a number of audio nuts (I count myself among them).  Unlike me, they use iPhones, connect the iPhone to a small, portable external unit that includes a USB DAC and headphone amp. Their headphones are then plugged into the external unit.
 
I currently use an external unit (USB DAC/headphone amp) with my laptop: Laptop USB out --> external USB DAC/headphone amp --> headphones. This bypasses the DAC built into the sound card of the laptop and dramtically improves sound quality.
 
Question: can I use an external USB DAC/headphone amp with the Windows Phone 7 using the micro USB out on the bottom of the phone to a mini USB in of my external unit? I am assuming using the 1/8" jack at the bottom of the phone next to the micro USB out would not bypass the internal. Thanks.

 

[flyfish2002]

To close this thread if anyone cares, HTC indicated that the micro USB out does not support digital out to an external DAC.

 

[a_tumiwa]

of course does not support, mobile phone is not a computer, the usb output of mobile phone can only for data transfer, cannot do multi-function like computer

 

[hyogen]

still not supported by either android or windows 7 phones.  sad