Port Area

[JoeK 10+ year member]

I brought my box to a professional box builder for opinions and he told me my port area was too small. Its 2" wide and 15" tall all the way back. It's an L port.

The box he has waiting to build for me has apparantly a wider port area. What exactly will this mean for me? Hes tuning it to 30hz but im not sure if that matters

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[Team Ampere 10+ year member]

I mean, other than maybe a little port noise from the port being a little narrow, i dont see a big problem with it. maybe you could go 3 inches wide??

Whats the net volume of teh enclosure after woofer displacement??

 

[JoeK 10+ year member]

I mean, other than maybe a little port noise from the port being a little narrow, i dont see a big problem with it. maybe you could go 3 inches wide??
Whats the net volume of teh enclosure after woofer displacement??

5.5 i think it was, the figure in my sig is wrong.

 

[Kangaroux 5,000+ posts]

Generally you try to keep the port ratio to an absolute minimum of 1:8 with 1:6 - 1:5 being ideal. 2/15 = 1:7.5 which is pretty close to that minimum. Plus that's only 30 in^2 of port. For a 15" sub as big as the one you have (which iirc is the XL?) you could get away with a lot more port area. 60-80 in^2 would work well.

 

[JoeK 10+ year member]

Generally you try to keep the port ratio to an absolute minimum of 1:8 with 1:6 - 1:5 being ideal. 2/15 = 1:7.5 which is pretty close to that minimum. Plus that's only 30 in^2 of port. For a 15" sub as big as the one you have (which iirc is the XL?) you could get away with a lot more port area. 60-80 in^2 would work well.

Yes it is the XL. The builder quoted me @ 3.25 net 30hz with .. 'large' port area. He said the box would be around the size of mine now im dimensions, but most of it is going to the port. My box now is too big volume wise anyways

 

[Kangaroux 5,000+ posts]

Yes it is the XL. The builder quoted me @ 3.25 net 30hz with .. 'large' port area. He said the box would be around the size of mine now im dimensions, but most of it is going to the port. My box now is too big volume wise anyways

Yep that sounds like some good specs. Get your port area to at least 60 in^2 and you should be alright. I wouldn't go too big though because you aren't running a huge amount of power.

 

[hispls 5,000+ posts]

Sounds awful as it is. Not great as you plan, but better. 30" port is totally inadequate for a high powered 15" woofer.

 

[Phoenix Risen 10+ year member]

im a port area junkie... my daily enclosure for my pair of 8's has 60" worth, and its only a cube and a half... (and no i dont have any performance issues with it)