When trying to calibrate my 13 y.o AA 5.1 speakers with Audyssey, all sounded similar except one surround. Test tones in the others sounded a little like a goose quacking, but one surround sounded like a mouse.

The speaker has only been sitting on a high shelf all these years, so I don't know if it could have been damaged. It was never used at high volume. I rechecked the speaker wires to make sure they were tightly connected at both ends and in phase.

Is there something I should check in or on the speaker? Do I need to replace it?