Just to add my 5 cents - I've been an SB user since day 2 (SB2) and been through SLIMP3, SB2, SB3 and SBT, all with stock PSUs. I used to run SBT - DACMagic - Naim 52/SC/135 but now run my main SBT coax into Devialet D200 (internal DAC) and it sounds great.
I have an SBT into AudioEngine A5...