Intrude on others? He is building an SQL setup, not meant to rattle cars 50 feet away, but to reproduce music as accurately as possible. To me, intruding on others is when I see a harley go by and you can hear the pipes for 5 blocks, not a pro level audio system in your car.

I can still hear well enough to tune high end home or car stereos and enjoy a nice 7.2 setup at home as well.