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View Full Version : Need help!! Will this hurt my sub?

sdimeconcept
12-04-2006, 11:27 AM
I built a box for my Type R 10 the other day. I had the volume at right over 1 cubic feet. I built the box a little big, but when building the box, we built the box a tad bit bigger. Alpine says a ported box should be built between .8 - 1.25 cubic feet. This box is 1.97 cubic feet. I haven't calculated the room the sub takes up, or the 3" pvc port at 7.25 inches at 32 hz.

Will having that much extra room damage the sub? Should i build another box or will this one work?

Thanks!

lilmaniac2
12-04-2006, 11:33 AM
should be fine

Nikuk
12-04-2006, 12:15 PM
1.97 - 0.03 - 0.15 = 1.819 ft tuned @ ~33hz

It'll be fine, though You're a little low on port area:box vol. for my tastes.

Immacomputer
12-04-2006, 05:17 PM
There will be port noise.

sdimeconcept
12-04-2006, 06:28 PM
Will the port noise be so bad that it warrants building a completely different box?

Nikuk
12-04-2006, 06:54 PM
You need more port.

4" aero, 12" long will put You at 1.7 ft @ 36hz

Roughly double the area.

You want (ideally) 10 in^2 of port per ft^3. This figure, is up for debate.

sdimeconcept
12-04-2006, 06:58 PM
So go 4" instead of 3"? Should i still figure the port length on 1.97 @ 35 hz? I've also thought about going to 33 hz, but I'm not sure.

sdimeconcept
12-04-2006, 06:59 PM
As far as 4", I just bought the 3" pvc pipe. I'd rather use it if at all possible. I may just have to use the extra mdf and build another box.

Nikuk
12-04-2006, 07:02 PM
You can run (2) 3" ports 18" long.

This'll get You 1.65 ft @ 33hz, with 8.5 in^2 of port.

sdimeconcept
12-04-2006, 07:03 PM
So port placement really doesn't matter then? It's an L shaped box...

Can you place both ports on the same side? The box is only 24 inches long in the back...

Not sure exactly how to place the ports...

Nikuk
12-04-2006, 07:09 PM
preferrably on the same face as the woofer.

You can use 90* elbows as needed.

Immacomputer
12-04-2006, 07:15 PM
You can run (2) 3" ports 18" long.

This'll get You 1.65 ft @ 33hz, with 8.5 in^2 of port.

14 in^2 of port area, not 8.5.

pwnt by pat
12-04-2006, 07:33 PM
build the box biger, use two sections of your 3" pvc, and double the port length.