Speaker enclosure tuning help requested..

[dobbhill]

I have a couple of existing 1 x 12" enclosures that I wish to re-tune for different speakers. They are designed for Celestion V30's, which I don't have. I have a JBL G125, and a re-coned K120 that I'd like to fit in the box. I have all the T/S parameters for the drivers, and the dimensions and existing port tuning info. I was hoping to modify the ports to accomodate the replacement speakers. I would just put a V30 in there, but I'm not fond of the mid balance...always an option, though.
Is there any reasonable/free software available that will help me re-tune the ports for this project? I have played with WinSD some, but not a real clue as to what I should do.
When I just pop the G125 in there, it sounds great, except the bass dies at about 120~Hz. I'm spoiled by the bass response in my Altec 417C x2 in a Dumble oval back 2x12": my standard.
Thanks for looking.

[Structo]

I had a program that calculated internal box volume and port specs but I can't find it right now on my PC.
I know it was a freeware type program so you can probably google for it.

You have to enter all the specs for the speaker so you need those to do it.

[Jana]

http://professional.celestion.com/guita ... /index.asp

go to that link and select from the drop down menus.

[ER]

If you're not building from scratch, this should get you in the ballpark;

http://www.lansingheritage.org/images/j ... page11.jpg

If you build one from scratch the math is pretty easy with T/S.

-ER

[ER]

Smaller, longer = lower.

You may be able to get there by ear.

Erik