Stan, the thought is always there, but I'd have to build both ends in order to have the complete package. I certainly wouldn't want tuning coils, that raises the complexity and reliability I would expect. It would make for a more compact package. I'm eager to see what the EMI filter on the speaker does for the existing setup. If that works well, I'll probably order the basic $30 worth of boards (minimum order) and build up one to see how it functions.
This board appears to use a BY8001-24SS chip to do the basic functions, there's an Atmel serial EEPROM, presumably for parameters, and then a 8 pin chip labeled MIX2002CN?4S0N, the ? is a number I can't read. I find nothing on that chip in a search. The mystery chip seems to most likely be the amplifier, it's next to the speaker leads. Since two of it's pins are directly connected to the speaker, that's a good indication. 
