devinplombier, the TDA3255 is no where near the 250 watt rating per module Input is 240 watts per pair. Efficiency is 80%. Output is 192 watts or 96 watts per module. However 80% efficiency may be doubtful. I say each module provides 65 watts RMS per channel and I use about 5 watts average for listening. No matter what some others stated distortion is about 1% at the 65 watts per channel.
The Douk NS-13G will sound as good as expensive amps till your speakers exceed at least $2K. Then you may hear some improvement with the expensive amps and speakers, Unlike the Douk some amps do not have tone controls to tune your speakers response.

