dead diamond tweeter
A shorted series cap in the tweeter crossover will cause low frequencies to be sent to the tweeter, causing it to fail over time. This type of crossover capacitor failure may not manifest itself as something clearly audible.
An underpowered amp driven into clipping will also fry a tweeter but I would guess this would happen in both channels, not just one.
I would at least have the crossover in the suspect speaker tested. Any electronics tech with an LCR meter can do it.
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Main System:
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Amati Homage VOX Center,
Proac Response 1sc Rears,
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MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
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