View Full Version : Need help building box for 2 10" perfects

BLD 25
12-29-2005, 11:06 AM
Hey, i have seen threads about two subs before, and i have some questions. My main question is should the subs share a chamber and have only one port, or should they have separate chambers and a port on each sub? On the threads i have read previously, people said it didn't matter to have them share a chamber, but i don't understand how that doesn't make a difference. Wouldn't each sub feel like it is in a box twice as big? Any help is appriciated.


12-29-2005, 11:09 AM
i'm not sure WHY exactly each sub in a shared chamber box only sees half of internal volume, but it does...

just build a shared chamber box... easier and smaller... Those perfects will be very nice :)

BLD 25
12-29-2005, 11:24 AM
Thanks, i think they will. :) I just used a program for slot built boxes, and the slot area is nearly the size of the rest of the box. One of the reasons i wanted the perfects is they use a very small (1 cube) ported box. So i need to figure out what size port to use. I have a 4" port laying around, maybe that will work.

It is so weird how they see the same volume.

12-29-2005, 11:33 AM
hmm your slot area shouldn't be as big as the area the sub sees... the 10's should have about 3 cubes for the pair ported... right?

BLD 25
12-29-2005, 11:41 AM
Here is the program.


Qts .42
Vas 1.36
FS 28.35
length 24
height 18


it comes out to a HUGE box. are the tube ports that bad? In a tube ported box, i would just build it 24 x 13.5 x 13.5 which would be two cubes, and throw a port in there. It would be nearly two thirds the size. Thanks for the help!

BLD 25
12-29-2005, 07:12 PM

BLD 25
12-30-2005, 11:10 AM
bump for help

BLD 25
12-30-2005, 07:04 PM

12-30-2005, 07:09 PM
That caculator *****.I've had it say make the box 1,000" + deep and to use 40 + sheets of MDF.....pathetic.

BLD 25
12-30-2005, 11:35 PM
yeah, it does that for me, too. So anyone have any help? If it really doesn't make much difference to share a chamber, can it share a port, too?

BLD 25
01-01-2006, 11:39 PM
lil help?

01-03-2006, 01:30 AM
i've heard that cancellation is possible with shared chambers, as far as sharing a port, i think thats possible as well, although i'm not sure how you would share a round port if you had seperate chambers.

BLD 25
01-03-2006, 10:12 AM
I meant sharing a port if the chamber was shared. I will probably do separate chambers and pvc pipe for ports in each chamber.