A very nice little amp. Well worth it with the power supply. Looks like an AB type with heat sinking to the case. Built very well and solid. Sound is great. Used it for the surround speakers that do not need a ton of power. Ran thru the 20 to 20000 test and sound was solid. Base and treble controls were smooth along with volume. Once balanced with the rest of 5.1 system the output was clear and acceptable. Met my expectations especially for an AB type system. Not made for rattling windows and doors - geared for a pleasant background system.