Absolutely wrong.
police can impound any vehicle if police believe it is likely that it played loud music.
Why? Because it's so equipped to do so? Sort of like everyone with a gun is a murderer?
Some people have boom cars that they only take to competition. My car's system is about 800 watts, but that's because that provides pure, clean sound at low volume as well, I listen to trance and progressive that benefits from that. It
could crank up enough that a remote control would be needed, but I've never done that, and have no desire to do that. If someone opens the trunk, though, they'd see the massive Infinity amp bank built into the trunk sidewall, so could assume it could play loud music. Because it can. But it doesn't.
It's assuming that the legally owned equipment is intent to misuse, just like IL is about guns, so no surprise.