recommendation: spray insulation. You stick the little nozzle tube in the grate, fill the space with foam insulation, which will expand and dry - wipe off any excess that oozes out, and voila: stuffed up speaker!
I bet you could stand on a chair, pop a ceiling panel next to it and cut the wires to the speaker in less than a minute if you planned it well. Can you find one minute in the day when there's no one around?
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Love the pics though.
*shudder*