1. ## Need help!! Will this hurt my sub?

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!

2. ## Re: Need help!! Will this hurt my sub?

should be fine

3. ## Re: Need help!! Will this hurt my sub?

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.

4. ## Re: Need help!! Will this hurt my sub?

There will be port noise.

5. ## Re: Need help!! Will this hurt my sub?

Will the port noise be so bad that it warrants building a completely different box?

6. ## Re: Need help!! Will this hurt my sub?

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.

7. ## Re: Need help!! Will this hurt my sub?

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.

8. ## Re: Need help!! Will this hurt my sub?

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.

9. ## Re: Need help!! Will this hurt my sub?

You can run (2) 3" ports 18" long.

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

10. ## Re: Need help!! Will this hurt my sub?

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...

11. ## Re: Need help!! Will this hurt my sub?

preferrably on the same face as the woofer.

You can use 90* elbows as needed.

12. ## Re: Need help!! Will this hurt my sub?

Originally Posted by Nikuk
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.

13. ## Re: Need help!! Will this hurt my sub?

build the box biger, use two sections of your 3" pvc, and double the port length.

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