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Old 31st December 2001, 08:53 PM   #1
diyAudio Member
Join Date: Dec 2001
Default Need some help please

Hi All,

I just found this page and it looks like there are alot of knowledgeable people in here.

I am hoping someone can help me out. I am planning to build a subwoofer for my car with 2 12" woofers that I have. My problem is that I do not know what the T/S parameters are for these speakers.

The are made by Electrovoice and the model number is 12TRX. They are quite old, so they are not on their web site. I tried emailing them (Electrovoice) but got no response back.

Anyone in here ever used this woofer before?

I was planning to use them in a bandpass enclosure, can I use a close enough guide to build the enclosure?

Sorry for all the questions and thanks to anyone that can assist.
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Old 31st December 2001, 09:15 PM   #2
Super is offline Super  United States
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Join Date: May 2001
Location: Connecticut
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Unless you can measure the parameters of the driver, I would suggest going with a sealed enclosure. This is a broad generalization, but you can yield acceptable results using between a 2 and 3 cubic foot sealed enclosure per driver. The best thing to do would be to build some temp enclosures and experiment.
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Old 31st December 2001, 09:32 PM   #3
Wizard of Kelts
diyAudio Moderator Emeritus
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Old is right. From what I can see from a search, that model had alnico magnets!

Actually, from what I can gather, alnico has some superior properties to ferrite, not sure why the switchover.

Anyway, here is a message board where some people were talking about using the EV 12 TRX. Check the Email addresses-they might be able to help.

I read in one message that the EV 12 TRX was different from the EV 12 TRX-B. Wouldn't know for sure.

There are ways of measuring for speaker parameters for the do-it-yourselfer if it comes to that.

Good Luck!!
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Old 4th January 2002, 11:36 PM   #4
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Join Date: Dec 2001
Thanks for the replies. That was one looonnnggg thread.

Can anyone recommend a software program for enclosure simulating?
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Old 4th January 2002, 11:48 PM   #5
ucla88 is offline ucla88  Tahiti
diyAudio Member
Join Date: Dec 2001
Location: rocklin, CA
why not alnico? since you ask

cruise down to the bottom of this page for some interesting tidbits on magnet materials.

more LDSG
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Old 4th January 2002, 11:54 PM   #6
diyAudio Member
Join Date: Dec 2001
Sorry, should have included this with my second post. Is there a FAQ somewhere on this page that can instruct me on how to measure the T/S parameters? I have never done this before.

Thanks again.
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Old 5th January 2002, 02:43 AM   #7
Wizard of Kelts
diyAudio Moderator Emeritus
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Here is one link:

This one has a link to a nice spreadsheet to simplify matters:

A lot of people recommend this freeware. I can't get the thing to work, but it is recommended by many:

This is an extremely nifty tone generator. I save mine to Program Files, so I can have it any time I want. You can either go up or down in preselected amounts, OR you can highlight the frequency display box and write in any frequency you want. Normally, you want to put it in sine wave mode for testing speakers, of course. You can go from 100 Hz to 99 Hz to 98 Hz, etc., if you want to. Just hook your sound card up to your stereo amp, and you are all set.
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