Modding the PS Audio Directstream DAC MK1 and MK2

My scope showing how clean the stock power supply is. The old FFT posted above is using the USB input. That is what causing the noise shown (ground loop). Not the power supply. Also there are at least two discrete filter / regulators circuits after the main power supply with the 317 regulator.

FYI. Noise is not the issue and not what makes this internal supply sound so good in the Signature Series PLUS.

Discovered last week that PS Audio has revised both boards in the MK2.

The analog board now has grounding tabs like the digital board. Also they neglected to remove the powder coating from them contact areas on the chassis making them grounding tabs they added useless. They also are now switching the neutral power along with the hot power via the rear power switch. (DPDT switch). On the digital board they repaired one of the patches they did on the original and added a second IC option (set of pads) instead of using them adapter boards like they did in the past. Not sure I like the idea of having open pads on the digital board as it can act like an antenna and susceptible to noise.

We also would like to inform MK2 owners that we will resume MK2 Transformers and mods however we will no longer ship transformers. The MK2 will only be upgraded in house.

MK2 upgrade

You would still rank the Signature Series Plus higher than the MK2s with these new transformers?  Still prefer the Snowmass FW for MK1?  Thanks

Yes With the Signature Series PLUS it is now much easier to hear the difference. We feel it sounds much better and more focused. We install Snowmass V1 on all our Signature Series DAC’s. We feel it is a much better match with our upgrades.