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For most practical purposes and in most situations there really is no such thing as under driving a pill amp unless there isn't enough input to get it to key or the relays are chattering.

 

A very very low level input on a high output amplifier may sound muffled but with the way amps are made these days I doubt you'd damage an amp.

 

In most cases if you can get a large amp - such as a 1600 to key, (even with the minimum input require to get it to key) the output of the amp is enough that it wouldn't be falling into those oscillations.

 

But the real question is "why would you under drive your amp in the first place"?