Does it have a bridging switch?
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Do some research on bridging to see how it affects the load a bridged amp can drive. Typically, the current draw on the amp is equivalent to it driving a load with 1/2 the impedance. Thus, an 8 ohm load acts like a 4 ohm load etc. If the speaker's impedance dips to 4 ohms and your amp is not spec'd for 2 ohm loads, its protection circuit may activate.