...Pre-assembly to check things out. 5 1/2" not including speaker mount. Should be an easy fit with room left for wiring and connections.

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...and I wanted to take a shot at a simple crystal chamber. Still needs some cleaning up and minor adjustments. MHS disks, bits of brass rod/tubing and micro ball ends from my r/c scrap box, and a crystal pirated out of a cheap Michael's pendant...

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