Need some port help...

[!!!BLINKY!!!]

All right lets just get right down to it.. My box is 33x28.5x18 port is 16.5x10x10.2 sub displacement is .26 per sub.. By my math i should be tuned to between 52-55 but im down at 49-50.. and would like to be 55-60... Ive run it through a few diffrent calculators and had friends look at it to and we come up with the same thing so i thought i would ask on here... Im putting up a 148.5-148.7 at 2500w i should be up over a 150 when i get my tuneing right... So what you guys think? I will rebuild my box if need be.. Idea's and designs welcome..

[JCiarlino]

Assuming you are using 3/4" wood, I am coming up with 57Hz.

Edit 56Hz.

Edited March 22, 2010 by JCiarlino

[!!!BLINKY!!!]

Assuming you are using 3/4" wood, I am coming up with 57Hz.

Edit 56Hz.

And when i test im at 49-50 so somethings not adding up... i was at 40hz with it 6in wide...

[JCiarlino]

Hmm... I have no idea then.

[Boon]

What's the vehicle? Perhaps your cabin peak is larger than your box peak. But that would be a pretty fail box.

[!!!BLINKY!!!]

What's the vehicle? Perhaps your cabin peak is larger than your box peak. But that would be a pretty fail box.

Its a 03 Chevy Tracker.. The tuneing for my car is higher somewhere up around 55-60.. Havnt quite found it yet but if my box is not tuneing to where it should be im not going to be able to find it, ya know? I gained 1.2 DB's from changeing my frequency from 40-49.. so im still getting louder i just havent found my peak frequency yet..

[chewie]

sine sweep.