1. ## 4" Port... Big Enough For This Box?

If I had a box for 6 8" subwoofers, with a net volume of 4.46 ft^3, would a 4" port be big enough? It would be 3.5" long, which would tune it between 34hz and 35hz.

2. ## Re: 4" Port... Big Enough For This Box?

I would do at least 1 4" port per pair of 8s personally...

3. ## Re: 4" Port... Big Enough For This Box?

so 3 4" ports, how long would each have to be to tune to 35hz? Would it still be 3.5 inches, or does it change when you add more ports?

Bumped TTT!

TTT again...

6. ## Re: 4" Port... Big Enough For This Box?

Ttt, when adding more ports to you have to increase the length of each to maintain the same tuning?

7. ## Re: 4" Port... Big Enough For This Box?

I just learned this last night:

For multiple ports, just divide the volume of the enclosure of the box by the number of ports, and calculate each port by itself

So with your numbers above, you divide 4.46 ft^3 by the 3 ports = 1.48 ft^3 per port

Now calculate the port as you normally would to tune a 1.48 ft^3 box to 34hz... then make all 3 ports that size. Get it? If not, I'm just wakin up, I can clarify later...

8. ## Re: 4" Port... Big Enough For This Box?

Originally Posted by Exaran
I just learned this last night:

For multiple ports, just divide the volume of the enclosure of the box by the number of ports, and calculate each port by itself

So with your numbers above, you divide 4.46 ft^3 by the 3 ports = 1.48 ft^3 per port

Now calculate the port as you normally would to tune a 1.48 ft^3 box to 34hz... then make all 3 ports that size. Get it? If not, I'm just wakin up, I can clarify later...
Ahh, I get it, that makes sense. Can anyone verify that?

9. ## Re: 4" Port... Big Enough For This Box?

I got it off JL's tutorial site if you wanna check that out

10. ## Re: 4" Port... Big Enough For This Box?

Alright, it's not that I didn't believe you it's just that you said you learned it last night.

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