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View Full Version : Dual Ported Box- like a bandpass?



Buck
07-15-2008, 11:47 PM
Has anyone ever attempted to make a dual ported box? Like a bandpass box, but both sides are ported, not 1 sealed and ported. Maybe one tuned low and one tuned higher? would this work, i'm curious about this

schrummy
07-16-2008, 12:00 AM
well...................................one way to find out for sure.
build it and find out

cycloneman
07-16-2008, 12:05 AM
Been done many times. It's called a 6th order bandpass. Here's a link - http://www.diysubwoofers.org/bnd/6thorder.htm

cycloneman
07-16-2008, 12:07 AM
Here's some more good info - http://www.the12volt.com/caraudio/boxes6.asp

jmanpc
07-16-2008, 12:08 AM
Been done many times. It's called a 6th order bandpass. Here's a link - http://www.diysubwoofers.org/bnd/6thorder.htm

not necessarily. A 6th order is a ported box firing into a ported box. he was wondering if anyone had made a box where there was a sub in the middle, and 2 ported chambers, each firing out.

in a nutshell, OP, that wouldn't work. the chambers would cancel each other out. one is sucking air in, and the other is blowing air out.

Buck
07-16-2008, 12:14 AM
not necessarily. A 6th order is a ported box firing into a ported box. he was wondering if anyone had made a box where there was a sub in the middle, and 2 ported chambers, each firing out.

in a nutshell, OP, that wouldn't work. the chambers would cancel each other out. one is sucking air in, and the other is blowing air out.

i see

cycloneman
07-16-2008, 12:18 AM
like this? - http://www.the12volt.com/12voltimages/dualrefbpass.gif

Buck
07-16-2008, 12:19 AM
like this? - http://www.the12volt.com/12voltimages/dualrefbpass.gif

ya like that

pjvoc
07-16-2008, 12:21 AM
well the box im doing is kind of a dual ported box, its for 2 15s but because of the center divide its like 2 boxes into 1...

http://i85.photobucket.com/albums/k70/YOungBloodz2003/Picture2.png

cycloneman
07-16-2008, 12:21 AM
Yeah...that's a 6th order dual reflex enclosure. Read the info on the www.th12volt.com link I posted above. Explains the pro's and cons.

helotaxi
07-16-2008, 04:15 AM
not necessarily. A 6th order is a ported box firing into a ported box. he was wondering if anyone had made a box where there was a sub in the middle, and 2 ported chambers, each firing out.

in a nutshell, OP, that wouldn't work. the chambers would cancel each other out. one is sucking air in, and the other is blowing air out.

Um, no. What he described IS a one type of 6th order bandbass. The most common type in fact. What you're describing is another type usually referred to a a series tuned bandpass.

With a basic 6th order, the two chambers are different sizes with different tunings and the potential is there for a hugeincrease in efficiency over a narrow passband. The potential is also there for very good transient response with a loss in efficiency over a wider passband. That type of design is a lot more flexible and tunable than the basic 4th order.

Ed Lester
07-16-2008, 08:53 AM
we have been doing these types of bandpasses for years. They are very finicky and difficult to make sound good. But in extreme type SPL cars they are proving very useful. 180 dB useful.

soloXgt
07-16-2008, 10:05 AM
u meen like this?? http://www.caraudio.com/forum/showthread.php?t=289236&highlight=chambers