SPL port?

[DudeWith4x4]

I was wondering if I could get your opinoin on if you guys think this would work. I was wanting to be able to have a port that would sound good for daily listening to the subs and then I wanted to be able to add a section to raise the hertz. Its basically just a PVC thats flared at one end and the other end is sleved where it can slide in my other port. So what Frequency should I tune box for SPL? I have a Ext-cab f150.

Here you can see the port Ill be sliding it into.

[BJD3]

Unless I'm overlooking something, this would do the opposite of what you want. You would be extending the port, and dropping the tuning.

i r confuzzled.

[DudeWith4x4]

Wow I may come out lookin like a total idiot here. So if I add to the port it'll make it tuned higher? I was wanting to go from like 36 to like 50 some htz

[wizart383]

Usually longer port=lower tune freq.

You should down load the torres calculator and play with the port length. Or the psp port calculator should work also.

[Autruche]

Make it so that the port is mounted to a removable plate. then you can have your big high tuned burp port in for competitions, then take the port out, then slide the lower tuned daily port and plate in.

Edit: Check this thread: http://www.stevemeadedesigns.com/board/topic/92401-how-to-make-an-interchangeable-port/

Edited June 26, 2011 by Autruche

[DudeWith4x4]

The port in it right now is tuned to about 35-36hz. My question is if you add port you can tune it to like 50hz for comps? is that the best frequency?

[Louisiana Bass]

If you add port, you get lower frequency. To raise tuning, you have to be able to somehow shorten it up.

[DCmagnum]

The port has to cut shorter to raise the tuning....long is lower

[DudeWith4x4]

question here... Do you want higher or lower fequencys in SPL comps.. I've never competed or ever thought about it till a guy at a shop told me I should today..

Thank all of you for your input as well and bearing with me.

Edited June 26, 2011 by DudeWith4x4

[fecupe2001]

question here... Do you want higher or lower fequencys in SPL comps.. I've never competed or ever thought about it till a guy at a shop told me I should today..

Thank all of you for your input as well and bearing with me.

In theory, you want to burp as close to the resonant frequency of the car as possible, i´m saying in theory because this isn´t a constant, for example, my explorer´s resonant frequency is 51 hz but i´m using big ass and efficient boxes now and they peak lower than 51 hz but i still get louder on the meter

Anyway, yes you want higher frequencies for comps, you just need to get a shorter port with a higher frequency and leave your current port with a 35 hz tuning for daily. Said that, easiest wat for you would be to find a meter for an hour or something like that, get a 40 hz tuning port and start cutting the lenght of that port until the score starts dropping on the sensor, that would be your comps port, if you don´t have acces to a meter, then i would say something like 45 hz tuning port for comps?? i dunno really, i´m just throwing ideas...