My concern with A/B mini amplifiers is always heat. At least the large ones have a large heat sink to dissipate the heat. Just because the amplifier is small, this does not make all the heat generated by inefficient Class A/B technology will go away. It will stay. I have an MB Quart REF4.80, which can be classified as mini. The thing runs very hot and will go into thermal shutdown if there is something in the trunk that can obstruct air flow near it, even though all channels are running at 4ohm with two channels powering tweeters(!) and two others powering mids. A lot of people running Massive Audio nano series minis have issues with heat too. Nothing is more embarrassing than have the stereo shutdown 30 minutes after turned on on a long trip with buddies because the trunk is filled with luggage.