The preamplifier is the actual heart and brains of the system.
Almost every manufacturer recognizes this as a fact (PS Audio is not a subscriber to this) McIntosh, Pass Labs, Lab 12, EMM, Raven Audio, AGD, NAD, Audio Hungary, LTA, Simaudio, A-S, Rogue, on and on.
Also it is interesting that the majority of owners of separates utilizing Class D power amplification are using Tubed Preamplifiers like LTA, A-S, AR, SUPRATEK. Quick Silver, on and on.
So Mark is behind the success and makes Bruno's module sound good.
Just saying and pointing this out.
Have a good evening.
Bruno designed the amp module which is the heart of the amplifier.