Either one can be effective, it's a matter of sufficient pitch difference and increased volume. Almost on topic, some residents of my former high-rise barracks

Either one can be effective, it's a matter of sufficient pitch difference and increased volume. Almost on topic, some residents of my former high-rise barracks liked playing their bass tracks blaring out the windows, which got my roommate and I thinking, if they have the bass, we can take the treble... and we got our competition bagpipe CDs out and cranked them up. We made our point. (And the barracks mangers shut us both up... )