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Username: gtrguy

Post Number: 19
Registered: 9-2004
Posted on Friday, October 14, 2005 - 9:47 am:   Edit Post

Hi folks,

I want to build a speaker cab around a 15 inch EV speaker I own. I pulled it from a Lab Series L9 amp (vintage BB King stuff) after plugging it into the SWR to make sure it sounded good (it did) I will be using it for practice, so it needs to fit in the trunk of a Mustang (cab should not be over 14 inchs wide. I want a small size and will be using it with a SWR 350 head just for practice.

I don't know if I need a closed cab with a port, or what kind of port. Can anyone help me with some advice?

Username: phys49

Post Number: 21
Registered: 4-2005
Posted on Friday, October 14, 2005 - 11:01 am:   Edit Post

If you can find the Thiele-Small parameters for the speaker, you can build a box that will give the best sound for the smallest volume.
Without them it is pretty much a guess but a box 12 inches deep by 18 inches wide and 24 inches high out of 3/4 plywood or particleboard will probably give a decent sound.
As for the port, use a slot port similar to SWR construction all the way across the bottom of the front baffle. You may have to experiment with the height of the port. Start with 1/2 inch then go to 3/4 or 1.0 inch if there is too much whistling.
Do not expect maximum performance using these dimensions. They are just a guess based on my experience with EV 15 inch speakers.
best of luck,
Senior Member
Username: bassman10096

Post Number: 813
Registered: 7-2003
Posted on Friday, October 14, 2005 - 5:49 pm:   Edit Post

There's a very good free download cab design calculator at http://www.linearteam.dk/default.aspx?pageid=teaminfo. I've used the calculator successfully for several years and 4 or 5 cabs. It's very easy to use, but best of all, the calc has T-S parameters for a couple hundred drivers that are listed by make and model. You don't need to enter or even know the T-S data. And the calc can adjust for any size or dimensions you tell it. Saves a lot of trial and accident.

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