View Full Version : What can you do when you can't make the box big enough

06-14-2005, 11:53 AM
Hey guys,

It's been a few years since I've done a system. I'm a bit rusty on the finer points. I'm not going for any competition; just picked up a simple setup to improve my ride.

I have the Sony XSL102P5 sub to put into my '93 Ford Explorer. It calls for 1cu. ft. sealed. For the music I listen to I want to go w/ a sealed box. I'd also like to put it in the "bin" in the back. Q-logic makes the custom box, but it's only .65 Cu.ft. WAY to small. I can build an MDF box in the wall behind the panel, but I don't know yet if I can get enough volume. Are there options? Someone once told me some baffling put in the box will make up for a lack of cu.ft. Is this accurate?

I figure taking the size of the sub into account, I'd really need to have about 1.25cu.ft. when all's said and done, right? Thanks for the help...

06-14-2005, 11:55 AM
put poly fill in the enclosure.....

06-14-2005, 12:18 PM
Is there a formulated amount, or do I just use the put some in and hear how it sounds method?

Thanks again.

06-14-2005, 12:22 PM
cram as much as you can in to get the most out of it :)

06-14-2005, 12:23 PM
I believe it is 1.5 lbs per Cubic foot.

06-14-2005, 12:24 PM
I believe it is 1.5 lbs per Cubic foot.

sounds right

06-14-2005, 04:26 PM
does that mean for him to make the .65 cuft he would need .35 x 1.5 lbs of poly fill?

so about 1/2 lb poly fill to compensate for the small box?

06-14-2005, 04:44 PM

06-14-2005, 04:51 PM
just build a box up to specs and fill it anyways

06-14-2005, 04:52 PM
Well since the .65 is BEFORE the displacement of the sub ( i believe), it'd be more... I'm going to make my own enclosure and try to use more of the space behind the panel; try to get closer to 1 cu.ft. However, with the displacement I will most likely have to put between .35 to .5 cu. ft. worth of polyfill... Doesn't seem too bad... And I know I can make it look just as good as the Q-logic, for much less than the 180 they want for it...

06-14-2005, 07:55 PM
actually for a .65cu box you would need closer to lb.
I would start there and if it doesnt sound right, then +/- till it sounds right to you.
Good luck!!

06-15-2005, 07:32 AM
Several of the sites I visit seem to say 16oz of loose polyfill per cubed space. Make sure not to pack it tight since it'll lose the effect it's creating.

06-15-2005, 11:41 AM
x2, I wouldn't stuff it too much.

06-15-2005, 11:55 AM
You will be fine running the sub in a smaller enclosure than recommended. Subs are very versatile. They can be placed in many box sizes. If you can get .65ft^3 than do it and add about 1/2 to 3/4 pounds of polyfill to the enclosure.

Then bump away.

06-15-2005, 06:09 PM
experiment. test different amounts. you may find that your box is adequate without any fill.