true, but thankfully the e39's are so well insulated, you have a hard
enough time getting the bass into the attached passenger cabin - let
alone eminating from the boot area to the rest of the world!
I've got a 10" sub in a sealed box in my e39 and whilst it's adequately
loud inside the car, outside, you don;t really hear it. Sure, you can
hear the low notes a bit from outside the car, as you'd expect with low
frequency sounds, but it's certainly not rude-boy loud....and there's
nothing vibrating itself off the car either, which also helps it be
less noticeable from outside the car!