12v Powered Systems - JL Slot port design

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JL Slot port design - Does size matter?

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Category: General
Forum Name: 12v Powered Systems
Forum Description: From Mini-rigs to ICE, all your low voltage audio needs here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=21024
Printed Date: 26 March 2026 at 11:21am
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Topic: JL Slot port design - Does size matter?

Posted By: Discogimp
Subject: JL Slot port design - Does size matter?
Date Posted: 04 November 2008 at 10:42pm

I been faf'n around with a 500/1 & JL 10W7 in what is meant to be a ported box made to jl spec but has been made in a wedge shape so not sure if it is or isn't jl spec

spose i can get the tape on it and work the volume out.

But that's not the question, i need to build a new cab to fit in the larger space i have

and working with a little program i've got the optimum size would be a 3.4 ft3 ported box

which seems to give a 3 db rise from 50 Hz down 6 db rise at 35 Hz!!!

The question is......is it worth making a box that large when i can make the jl

sloted port box at only 1.5 ft3? and do the above rise levels sound true?

Any body got any software to work that out?

cheers - Pete

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Nuf-Func Disco Devices

Replies:

Posted By: imageoven
Date Posted: 05 November 2008 at 9:02am

sounds to me like you need "winsid" - search for that and you should do ok.

Posted By: LunchieTey
Date Posted: 14 November 2008 at 8:23am

That's a big box for a car audio 10", they are designed for small boxes(loose suspension) and may suffer if it's too big. Just plot a xmax plot on win isd to see if you're needing a subsonic filter. The rise is perfectly acceptable, its a sub driver, not a prosound driver! Don't forget the car will increase volume below around 70hz at 12db/oct too

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Speaker addict