Update, I just spoke with Larry Owens. He calibrates the DEQX, and modifies them. He said my unit does have a potentially noisy SMPS. The 4 is Linear, the 5 is a high end SMPS that does not have the same issues. Other hardware in my unit is not on the same level as the 4 and 5. I am not sure how mine differs from the PreMate. I mostly listen to music via my Core Audio Kryptos music server. His suggestion is to try and keep everything in the digital realm for me. That way the power supply will not affect my sound near as much. I had to send him some pictures of the mother board in my unit. He is looking to see if he can add a SPDIF input/output to my unit. Boards differ on the year they were built. I would then install the Mate between my music server and my DAC. He believes that would get me a lot of bang for the buck. If I want Digital to Analog/Analog to Digital, I am going to need to isolate that part of the system from the noisy power supply, and add a new clean power supply. Something he can do, but more money. Just an FYI.
