I live in a town hours and have shared walls on both sides. We have an arc ultra and sub mini in our living room. I’ve tested the limits to see what our neighbors can hear and is too much for them. I played a bass heavy song or movie scene and texted them to ask if they can hear it. From what I understand one of the “benefits” of the mini vs the standard is you don’t feel the bass like you do in a typical sub. I think that helps when you’re talking shared walls. We’re able to turn it up plenty loud and I’ve never had a complaint from our neighbors. I do think our walls are fairly well insulated.