Last time, in Part 1, we retrofitted an old guitar amplifier cabinet with a 10W bluetooth-enabled mono amplifier, based on the LM1875. The results have been nice, but the audio quality is noticeably lacking. The sound has a dull/muffled quality, and there is hardly any punch or body to the bass.

Here in part 2, to help improve the sonic experience a bit, I evaluate different speaker drivers, build a simple passive crossover circuit, and improve the acoustic properties of the guitar amplifier enclosure.

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It’s been pretty quiet in the lab this summer, and playing around with an audio project has always seemed like a lot of fun, though, until now I’ve been a little too intimidated to try it out. My AM/FM radio gave up the ghost a while ago, so perfect, I thought. Now would be a great time to shake things up and modernize the lab with a custom bluetoothy speaker system on the cheap.

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