I linked my test to the AQ-3500D original which is the same overall board design... if you want to see the test really badly with the amp in the DC casing then invoice me for a DC-3.5k --
sundownz@sundownaudio.com via Paypal.
I will do a live video test uninterrupted of both amps. A quick look at the MOSFET counts and size of the transformers will tell you what you need to know about the designs... that the SAZ-3500D was designed to produce more power.
And again... nothing wrong with the DC-3.5k amp design but it's simply a less powerful layout as it has 4 fewer output FETs and smaller transformers.