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A bad amplifier can destroy a speaker.
A failing amplifier can send all kinds of DC garbage and pulses to the speaker that can damage the mechanical structure of the speaker, or warp the coil by heating.
If a speaker goes bad and is replaced by a new speaker which also goes bad, almost always will find the amplifier is malfunctioning and torching the speaker. It may not be producing audible sounds while doing this, in fact it may sound somewhat normal. Esp if the amplifier is DC coupling the speaker....you won't hear the damaging current at all...but the amp and the speaker coil will both be getting pretty hot.
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