Haven't tried the Mini-X. but hiss and hum is very dependant on the source, and on what else is currently plugged in using the same circuit to your wall.
The Lepai will hiss if the wires aren't correctly seated, or if I use a ****ty source like my PC headphone out. Once fixed, the hiss goes away.
Hum can be fixed by trying different outlets on different circuits. If the hiss goes away on another circuit, you'll need something like this:
I have had an Emotiva XPA-5 in my home theater. While it was a great piece of equipment, I recently replaced it with a Behringer NU4-6000 that was half the price, puts out more power, and sounds the same. You cannot tell the difference in an A/B test. I would like to hear the Mini-X, but I doubt it will be 10x the cost worth of a difference, considering I prefer the 2020a+ over my newer 200W Lepai as of now, because of the adjustable tone knobs.
When you deal with solid state amps, as long as THD is low and similar between models at the same power, you will be hard pressed to tell the difference between two of them, no matter what price bracket they are in. Power is power, unlike with tube or hybrid amps.
Edited by bhazard - 10/14/13 at 12:08pm