You can check the specs on the amplifier for "amps" no joke. That tells you if the peak current is high lets say 40 amps but big SS are higher. Whereas the cheap 5 lb 100wpc uses a power transformer delivering 100 volts which is all the amperage it's going to get vs, a 1kilo volt transformer -now the amp weighs closer to 100 lbs more - and has 1,000 volts to draw on. That's why there is a warning not to try to service it yourself "Lethal Voltage". The advantage is that you have head room for demanding passages.
