IIRC the only way to fry an amp is to hook it up with no load. Putting not enough load will fry the load when the amp overdrives it, putting too much load will simply make for a quiet speaker.
Really dependance on the kind of amp you tot. For older tube amps, this is a major concern indeed because they drive by current, not voltage, thus exploding the voltage when there’s no path for the current to flow. Modern class D amps don’t have this problem, those just hate short circuits as they drive by voltage.
That's not correct. These are class D amps. No load = no current flowing.
Too much load (low ohmage speakers - things that dip below 1.5ohms for extended intervals) means too much heat dissipated as switching current in the amplifier IC, which burns out a driver FET or some other part of the silicon die.
