Ignorance is bliss.
Re-posting someone else old data. This is from years ago with a stock unit.
Guess you will never know what you are missing.
Modding the PS Audio Directstream DAC MK1 and MK2
I would like to continue discussing all the mods we have created for these two DAC's as it seems PS Audio is no longer allowing discussions about them on their forum.
For reference here is a link to the closed discussion.
https://forum.psaudio.com/t/modding-the-directstream-dac-mki/2680
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Yes. These are very new. More to come later as more are used. A panel of listeners here all agreed that the new Signature Series PLUS tops all the DAC’s we have here in a blind A/B comparison. DAC’s we have here. 1- MK1 Signature Series, 1-Mk1 Signature Series PLUS, 1- MK2 with our transformers, dCS BARTÓK APEX, ADI-2 Pro FS R, and a Holo Audio MAY KTE. On loan a Danifrips Terminator Plus. The biggest difference in sound quality is a taller sound stage with more dynamics and micro details. Very focused compared to the new MK2. The MK2 is also more congested. Anyone in the Baltimore / Washington DC area are welcome to come visit us here in our studio to have a listen. Just leave us a message. |
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.
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