Ok, about time I add my further thoughts on this DAC after my last post (#140).

After installing the THS4032 op amp, this improved and opened up the overall sound and well, there was just more of everything. A very definite and worthwhile upgrade. Perhaps a little analytical however, just a little, somewhat hi-fi sounding.

I have now since installed the Burr Brown OPA2107 op amp and have to say that this, THIS, ..... is what I have been looking for. More body in the bass and upper mids and a super smooth top end that does not encourage harshness or unwanted sibilance. In vacuum tube terms - its lake a RCA 5692 versus any other 6sn7 gt tube! I am using this with 300B SE vacuum tube amps, hence the analogy .... The BB OPA2107 is like the OPA627, so it has been said, though at a lesser cost.

I also use the Apogee DUET, but the Beresford 7520 with OPA2107 now is my prefered choice. The DUET is not capable of driving the Sennheiser HD650, though, you will read comments that it does drive them,, blet me say that it does not... you may think it does until you hear the HD650 driven properly. The Beresford is absolutely capable of driving the HD650.

Just my thoughts and to mention that great chip - the OPA2107 that is another that you may want to play about with!!!!

DerrO