I have purchased 2 of these amplifiers with 2 of the respective SMPS240QR Switching Power Supply at +-65V, it’s impossible to get even the power of 50W for these amplifiers, when the volume goes upper then 30% the amplifiers shut down or go in protection mode. I can´t really understand why this is happening even with other speakers, so in my understanding its a 30 Watts amplifier module instead of the 200 W the manufacturer claims.
I connect them to several pairs of 8 Ohms speakers with the same results.
The sound is very good but remember to play at low volumes if you buy this product.