Well/trunk box for '91 Camaro

[Trixter 10+ year member]

hmmmmm so what frequency would I get if I would shorten the port length to say 7.5 or 8 inches ?
On the spec sheet it says, includes driver and port volume.

When you guys use rammat or dynamat, where do you guys put it ? everywhere ??

about 32-33hz...would sound nice...imo

i did it every where i could stick it...mainly in the trunk...like 2 layers. then spray glue that egg crate foam over it. also use the foam to stuff in the panels.

 

[vorgath 10+ year member]

Good *L* because like I said before, 9 inch long port would create minor problems for me, I'm trying not to make the box too tall. 32-33 Hz would be perfect.

Yeah I put some rubber matting, kinda like dynamat, maybe bit more like thick industrial gasket material, but running out of it, and I have some places in the trunk where it would be really tough to attach it.

 

[vorgath 10+ year member]

OK, used this link

http://www.linearteam.dk/default.aspx?pageid=ventcalculator

to calculate the port(s), however it doesn't seem quite accurate, maybe because my box volume is with and not without driver and port displacement.

http://manuals.harman.com/INF/CAR/Boxes%20and%20Parameters/1042W%20Tech%20Sheet.pdf

But am I thinking correct, when I say that I could go with two ports .. each 2 inches diameter .. and have them 8 inches long... I would get ... 33-34 Hz ?

 

[Trixter 10+ year member]

yes, 2 2" ports 8" long will land you 32-33hz.

 

[vorgath 10+ year member]

Awesome, ok I'll get some measurements for the build, and post it here before I run out and buy the MDF and PVC.

Oh, should I go with straight or flaired ports ?

 

[Trixter 10+ year member]

flared ports wil provide less resistance resulting in less possibility of port noise, but they cost more than non-flared. if your going with flared, they also use a different formula to figure their length than non-flared.

 

[vorgath 10+ year member]

Yes I believe they would end up being about an inch or inch and a half longer than non flared. hmmmmm two straight 8 inch long ports .. should I expect to run into port noise ??

 

[Trixter 10+ year member]

well, 1 3" port (7sq") has more area than 2 2"ports (6.28sq"). they did recommend a 3" port...so really, i would go with at least what they say or more to be on the safe side. if you went with 2 3" ports, it would be nice, but then you would have to make them longer. 2 2" flared ports...i don't think you'd have a problem. if you can do it, 2 3" flared ports would sound nice. if you go with flared, remember to keep them (the edge of the flare) NLT the port's diameter from the box walls and NLT the port's daimeter away from the back of the box.

 

[vorgath 10+ year member]

But I can most likely, not go with two ports, each 2x8 and have them straight, no flares ?