My name is ***** ***** I'd be happy to answer your questions today. I'm sorry to hear about your situation.
Any time a person exceeds acceptable noise levels, as set by city ordinance, the neighboring homeowners
can call the police. So the question, really, is what is the decibel level in his house? IS it louder than it what's allowed? There are relatively cheap electronic devices you can buy that will answer this question, and I've also seen phone apps. The first step might be to ask him to help you measure the noise - maybe it's louder than you think it is. Or if you're well within accepted ranges, that'll help you decide the next step to take. At least then you'll know if you need to look into some kind of soundproofing (or increasing insulation, if that's a factor).
Acceptable decibel levels are set out by city ordinances. Many cities have their codes online so you can check what noise levels are allowed at different times.
I don't think the definition of a "loudspeaker" would typically extend to subwoofers or a sound bar (because that's a specific term used to identify a specific object). But the HOA
could theoretically fine you each and every time your neighbor complaints, even if there wasn't a history. Those fines can add up FAST. So hopefully you can find another solution.
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