Turn the driver around inside the box?
I wonder what the state of the suspension is. I have a subwoofer that will
hit the buffers if driven too hard, but its not a Bose.
Brian

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From the Sofa of Brian Gaff Reply address is active
"JimK" wrote in message
...
Inherited a Bose am5 Ser2.

Seems fine until I crank it up, then the bass module starts to protest
with a resonate rattly noise on deep bass notes, however if I lay it on
its side and lean on it/ put a pile of books on it, all seems OK....

Any diagnosis thoughts welcome

TIA

Jim K