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Sounds like a job for a milling machine. Enough metal can be removed from the bottom of the tank to install a small speaker and retain enough metal for the motor mount. <br /> I realize not everyone has access to a milling machine though. <br /> You could drill holes clear through the bottom of the tank then use files to enlarge them to one large opening the speaker will fit into, then screw or epoxy a metal plate on the inside of the tank to mount the motor to. <br /> Would see through grills and fans and an internal speaker box be another approach? <br />
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