[Velocity]

I use the M1 HPA. Its a very rich sounding unit but with excellent and extended highs. The built in dac is not bad, but reaches to only 44000/16. Im using it with my HD650 and it drives it without any problem. 

 

[zzffnn]

For USB only, I suggest ODAC (JDS lab offers that). Don't let the price fool you. I have not tried ODAC yet, but O2 amp is excellent.

For coaxial and optical, DacMini is good. You may also consider AMB Gamma2 or PreSonus Central Station (which is a professional dac/amp/preamp that you can find new/used in local Guitar Center).

 

[Greeni]

I found Burson has much better tonality and PRAT, Musical Fidelity sound somewhat pale in comparison. YMMV.

 

[Gradofan2]

Quote:

Agree with Zarim. If you want a tight and fast bass response, the Burson is for you.
I liked it how well matches my HD600's, and heard good things about the Audeze + burson combination.   

 
The 160D is a superb amp / DAC combo, with great versatility (input and output) - great with high impedance phones, and very good with low impedance phones!