Wiring a JL w7

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=72178
Printed Date: July 15, 2025 at 7:57 AM

Topic: Wiring a JL w7

Posted By: cdub74
Subject: Wiring a JL w7
Date Posted: February 04, 2006 at 3:45 PM

Here's what I have: one (soon to be two) jl 12 w7 and an old school us amps 400x.

Amp specs are: 400 x 2 @ 4ohms or 750 x 2 @2 ohms or 1500 x 1 @ 2ohms (under rated, but anyway)

The jl is a single v.c. @ 3 ohms, so what is my best wiring configuration for now (1 speaker) and later (2 speakers)

Replies:

Posted By: DYohn
Date Posted: February 04, 2006 at 3:59 PM

Well as it is a SVC speaker, there is only one wiring configuration possible. As far as connecting to that amp, you may be in trouble as a US Amps 400X is only rated to 4-ohms when bridged. It will probably handle a 3-ohm load, so I'd try that. Bridge the amp with the one speaker and see if it remains stable. When you get two speakers, you'll have to wire them in series for a 6-ohm load.

i don't know where you got the specs you list. According to the manufacturer, that amp is rated as follows:

100 Watts x 2 into 4 Ohms

132 Watts x 2 into 3 Ohms

200 Watts x 2 into 2 Ohms

400 Watts Bridged into 4 Ohms

You may want to look into a different amp.

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Posted By: cdub74
Date Posted: February 04, 2006 at 4:07 PM

The amp your looking at is the new one. The specs I listed are correct and can be found at the old us amps site. Goto the old site and click on online documentation at the bottom then under white papers you will find it.

Posted By: cdub74
Date Posted: February 04, 2006 at 4:09 PM

I should also say that I have ran this amp @ 1ohm for a few weeks and had no problems.

Posted By: cdub74
Date Posted: February 04, 2006 at 4:11 PM

1500 watts @ 4ohms, my mistake

Posted By: DYohn
Date Posted: February 04, 2006 at 4:15 PM

Then it seems you have your answer. Cheers.

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Posted By: cdub74
Date Posted: February 04, 2006 at 4:22 PM

So how do I wire two of them?

Posted By: stevdart
Date Posted: February 04, 2006 at 5:19 PM

You've already answered your own question. Didn't you say above that you ran this amp at 1 ohm with no problem? 1.5 ohms is a lighter load, so....

You know there is a wiring configurarion application in the left column, right? 1.5 ohms or 6 ohms, take your pick.

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Posted By: cdub74
Date Posted: February 05, 2006 at 2:19 PM

Thanks for the help!