At long, long last my 15-inch coaxials are back in the living room. And now finished with a mahogany veneer. Admittedly they look nicer now than they did when they were just unfinished birch ply boxes. It did take a while, though. I bought the drivers and a friend of mine made the boxes back in 2015, IIRC. They've been in use all these years as "prototypes". Remember that saying about temporary solutions becoming permanent? It's not out of thin air where that idea has come from.
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