I solved the problem like other suggestions, except in true halfafish fashion I did it by blundering around in the dark until this blind pig found an acorn. :eek:
I removed the old speaker, used it as a template, and cut out a piece of plywood to fit. Two holes for speakers (I think I was able to fit 4" in there?) and some plumbers tape to hold it in place. It works great and sounds great.
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