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Originally Posted by PaoloJM
In short, a higher load is ok but not ideal in both Class A and AB.
A lower load is ok with Class A but definitley not in Class AB and solid state amps are designed to drive multiple different loads ( 4, 8 or 16ohm) but will put out maximum power to a certain specified load.
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There is a genereal rule of thumb that will change the way you look at this:
Solid State amplifiers will GENERALLY survive an open circuit (extreme high impedance) but not a short circuit (extreme low impedance)
Valve amplifiers will generally GENERALLY survive a short circuit , but not an open circuit.
Note the word generally, this indicates that this is not always the case, now considering that an impedance miss-match is simply a less extreme version of the above two scenarios, it should be fairly clear that an impedance miss-match (either higher or lower) is not good for your amp.