Congrats on the amps arrival, I'd like to know more.
2) The fan is absurdly loud when you start approaching reference volumes! it spins like a Georgia swamp air boat!
I'd not recommend changing it out, instead, try building some type of hush box or equivalent. Perhaps over time some safe fan change outs/mods will appear, but I'm not much on fan mods anyway. Many enthusiasts feel differently however.
3) The DSP can be manipulated or at least viewed (I didn't try to change anything) showing level meters and such while playing back, through USB. It's kinda cool to scroll through the setup with the USB connection while playing back music.
Can you monitor line voltage, and PS temp?
5) The power usage ........ I don't understand this high efficiency switching electronics --- how can you save that much power?
I believe it's class D amplification. In theory, the efficiency of class D amp is 100% Ideally, none of the power is expended as heat, all of the power throughput the amp, should be delivered to the load. These output devices either conduct, or they're open,..so no heat is dissipated. However, obviously there is heat issues, so some leakage current, or something is conducting at less than the theoretical ideal short, or open state.
In my opinion, unless they're incredibly robust and over sized, I'd never feed an amplifier through a power conditioner/surge protector. They don't need them, and they can do harm in dynamics limiting via voltage drop/current limiting. YMMV
Thanks for the updates