I purchased a compact class D bass head, (which shall remain nameless as others are as guilty) to try it as an ultra portable guitar amp (like Quilter). I ran it into a cab at about 5.5 ohms. Its basic voicing was not guitar oriented but could be tweaked via its EQ to be OK. BUT it was called a 200W amp. NO WAY was this a 200W amp. Not 100. Not 50. I guessed at 30-ish. Stuck it on the bench at 400hz and 5.5 load and measured a bit over 30W. ??? I emailed the manufacturer's service dept. (thanks for the response) I was told that this module is what they use (Icepower - 50ASX2SE) 'just like everybody else' and the sales literature may be using peak music power as its rating system. The specs are available on the module's supplier's website: 50ASX2SE ( the amp only uses the single channel version of the module) Amplifier Output Power per channel (1 % THD+N, 20 Hz – 20 kHz) 50 W (4 Ω) 25 W (8 Ω) Note the 25W at 8 ohms. A very common cab impedance. A very weak bass amp. A 200w amp will rock your socks. MAYBE you only need 25W in a package under 2 pounds, which is cool. Don't expect more. If you get a '700w' amp and expect the power of 2 SVTs expect a letdown. Try to get service info and check the specs at the source for more accuracy. Those 700w modules do exist but might be called '2000w' by some companies.