My biggest improvement with the PSA DirectStream was replacing the Bridge II with an sotm sms 200 Ultra Neo with a Crystal Cable Diamond USB cable...
The Bridge II is quite noisy as the designer Ted Smith indicated...
Modifying PS Audio DirectStream DAC
I just finished my first mod. It was for my PS Audio DirectStream DAC:
It sounds amazing now. Its like having a new piece of equipment. I was A/Bing it with my turntable and got confused as to which was playing! All the changes were pretty straight forward. They are described in detail on the PS Audio website. There are lots of pictures to help.