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jl audio 13w7, 1.5 or 3 ohms?

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=98702
Printed Date: December 07, 2021 at 3:57 PM


Topic: jl audio 13w7, 1.5 or 3 ohms?

Posted By: steveskal
Subject: jl audio 13w7, 1.5 or 3 ohms?
Date Posted: November 06, 2007 at 4:46 PM

Hello again, I am planning on putting a 13W7 in a ported box in the back of my ride with a JL Audio 1000/1 amp to it. My question is, since the speaker is a dual voice coil and the amp basically has the same output at 1.5 ohms as it does 3 ohms, how should I hook this up, does it even make a difference?

Now the last part to make me REALLY look like a dummy how do actually hook up it to get what ohms? Series, parrallel, all that stuff just goes over my head, I need instructions like "run a wire from one negative to......" well you get the idea, I need it spelled out for me :-)




Replies:

Posted By: dwarren
Date Posted: November 06, 2007 at 5:09 PM
The JL amps produce max power between 2 and 4 ohms, so if I were you I would wire the woofer up to present the 3 ohm load and call it a day. Use this link for wiring your speaker.

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Posted By: kamberkash
Date Posted: November 06, 2007 at 5:22 PM

To get a 1.5 ohm load you wire the positive terminal of the amp to BOTH positive terminals on the sub. Then wire the negative terminal of the amp to BOTH negative terminals on the sub. that is called parallel wiring.

For a three ohm load wire the positive terminal of the amp to ONE positive terminal. then wire the negative terminal on the amp to the negative terminal on the OTHER voice coil.  that leaves a positive and negative terminal open on the sub. Take a jumper wire and connect the open positive and negative terminals together.  this is called series wiring.





Posted By: steveskal
Date Posted: November 06, 2007 at 5:27 PM
Cool, thanks. So are you in agreement with the above post and that 3 Ohms in the way to go for this set-up?  Thanks




Posted By: extacy
Date Posted: November 06, 2007 at 5:37 PM

Since the 13W7 subwoofer is a dual 1.5ohm subwoofer ... with series wiring thats 3ohms, but not 1.5ohms with parellel ... rather 0.75ohms

So you should wire it up in series. Ill explain it in two steps for it to be easier for you

1) Positive wire from amplifier goes to positive terminal of voice coil 1. Negative wire from amplifier goes to the negative terminal of voice coil 2

2) A wire connectes the negative terminal of voice coil 1 with the positive terminal of voice coil 2.

... and voila! You are done!





Posted By: kamberkash
Date Posted: November 06, 2007 at 5:55 PM
Generally the more resistance the amp see's the better the sound quality will be , but in this case, im not sure if the damping factor decreases as the impedance decreases or not (usually it will resulting in less sound quality, but that jl amp you have is quite unusual).  I would go with the 3 ohm set up just in case.




Posted By: kamberkash
Date Posted: November 06, 2007 at 5:59 PM
and i did make a mistake, as said above. parallel wiring will result in .75 ohms. wich that amp cant handle very long before it shuts down, so yes go with parallel to 3 ohms.




Posted By: kamberkash
Date Posted: November 06, 2007 at 6:03 PM

oh my god! you will have to excuse me i've got a million things goin on right now....

What i meant to say is:

Wire your sub in series for a 3 ohm load. And this time im not mistaking what im saying!






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