Date: July 06, 2003 at 18:06:36 From:Andy, [pc-62-30-53-179-sh.blueyonder.co.uk] Subject: Re: You're confused in car audio.....
> to an unknown alignment (cabin volume with a vent the size of the door perhaps, or a badly loaded horn with the door as the mouth).
Yes that makes sense (also what Jakob said). BTW I don't think slight leaks make a difference to very low frequencies (no need to get cabinets absolutely airtight).
So large openings are like one big horn system, but difficult to predict... similar with home subwoofers - the whole house becomes an acoustic structure.
This is between the two theoretical situations (sealed volume and free space)... In our world things are obviously a lot harder to predict than for higher frequencies.