As far as I can tell from owning one, my mate used to own another one, and recently pulling apart one due to fried MOSFETs and MOSFET driver IC (catastrophical faulre, you know electronics operate on smoke, and when smoke gets out it stops working, well there were a lot of smoke getting out that one

), I've noticed the transistor they used for output channel, the wiriting on the amp claimed 1600WRMS, the power rating on transistor made each channel about 50WRMS, it has 4 channels thus making 200WRMS amp.
I aslo had similar catastrophical failure of my own one (which is a lot smaller model), than I had dry soldering in one channel (possibly reason of the first fauilure).
The SNR is not very good, the ground loops are very annoying... The control knobs are crap.
I would rather spend twice as much but get better product.