Yup, and conversely why it's hard to get accurate low-bass with car audio.

That's why you need to implement the use of a well-designed porting system, which works in tandem with the speakers, utilising the car's internal cabin volume, to maximise low-bass frequencies. But even then, genuine low-bass will still be compromised, compared with what's possible from a good hi-fi system, using big speakers in a large room.

It's not really an issue though with most music, and the grin-inducing, sledgehammer mid-bass punch and dynamics that's possible with the best car audio systems, which few home hi-fi systems can match, more than makes up for it!

Marco.