Question about Jl Audio 500/1 Car Audio Amplifier

# Wire 2 sub 4ohm

I have 2 svc 4ohm speakers how do i wire them for a Jl Audio 500/1 Car Audio Amplifier 1.5 - 4 ohm

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They want to wire 2 x 4 ohm subs for 1.5 ohms, which is not possible. 2 x 4 ohm subs, in parallel (the positive from both speakers and negative from both speakers wire to the same + and - out from the amp, in mono) would be 2 ohms. if the amp is stated to get, say, 500 watts at the 1.5 ohms, it will still get 375 @ 2 ohms.

if you were to take 3x 4 ohm subs, in parallel, the ohmage would drop to 1.33, and overheat the amp. you sort of need odd ohm-rated speakers to efficiently get to 1.5 ohms, like 3 dual voice coil subs in a parallel, series, alternating config, for a total of 2 separate parallel circuits, wired together in series (series is positive from one circuit, or driver, to the negative of the next series or driver). to properly reach 1.5 ohms.

the formula is the ohmage of the drivers divided by the number of drivers (or circuits) for parallel, shich drops the ohmage, and multiplied by, for parallel circuits. if one had 6x 1 ohm voice coils (3 woofers with 2 voice circuits apiece), you would need to run 2 separate serial circuits, then run the separate circuits together in parallel, or you would just need 2 x 3 ohm subs from the get go, 3 ohms / 2 = 1.5

Posted on Dec 28, 2014

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I am assuming these are subs, you didnt say, but that is my guess. do you want bass, or do you want to take it easy on your amp? do you have a terminal cup on your sub box, or just wires going into the box to the speakers? take it easy route: wire positive from amp to positive of one speaker, negative of amp to negative of the other speaker, with a jumper wire connecting the negative of the first speaker, to the positive of the second.
more bass route: run seperate positive and negative wires to each speaker, making sure to maintain proper polarity.

Posted on Oct 21, 2013

• Matthew Spark Dec 28, 2014

gheeze, joshcos answer nulligied my wiring schematics; however, for posterities sake, jl's wiring descriptions are for serial wiring (the former), and parallel, (the latter). the lower the ohms, the more power can be drawn, the higher, the less can gbe drawn- except for the case which joshco states (unique)

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Posted on Jan 02, 2017

It will work fine. This amp is stable to 1.5 Ohms, but is designed to put out about the same amount of power at 2 or 4 Ohms (unique).

Posted on Feb 12, 2008

SOURCE: jl audio 500-5

Assuming that you've confirmed that the speaker is in good working order and that the wiring isn't shorted in any way...

There are separate power supplies for the high and low amplifiers. It's possible that the one for the sub output has failed. If that's the case, the output transistors probably failed and that's what damaged the supply.

Generally, I'm willing to help people repair their amps but this is a large, complex amplifier and it should be repaired by a qualified technician.

Posted on Apr 19, 2008

You can connect them in a series/parallel configuration. Put two of them in series and then connect the last one in parallel across the two in series. This would give you an impeadance of around 2.7 ohms. Only do this if your amp is stable at 3 ohms or less. I am not familiar with the specs of your amp. If your amp is only 4 ohm stable you can not do this.
This would also give you half the power on the two subs in series as the power for the one that is parallel. The two in series would be sharing the total output signal, where-as the one in parallel would get the entire output signal from the amp.
if you were to connect a fourth sub woofer in this configuration it could give you a 4 ohm load, by adding the fourth sub in series with the single sub that is in parallel. or in other words, yu have two sets of 2 sub woofers each in series. That gives you two 8 ohm loads (two 4 ohm subs in series is 8 ohms). Then you take the two sets of subs and parallel them (two 8 ohm loads in parallel equals 4 ohms).

If i had a picture to show you it would make sense, two subs in series that are in parallel with two subs in series.

Posted on Jun 16, 2008

Just had a look at both amp and sub on the JL Audio website. The amp runs from 1.5-4ohms. 4ohms at 14.5V. The sub is running dual 4 ohms coils. That's what the D-4 means. So should be an easy set up. The amp has two mono outputs, so one for each coil. It looks like the perfect wattage to run the sub real nice.
Web page for amp: http://mobile.jlaudio.com/products_amps.php?amp_id=439
Web page for sub: http://mobile.jlaudio.com/products_subs.php?series_id=18

Posted on Nov 19, 2008

pooi

Posted on Jul 25, 2009

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if you wire the 4 ohm sub voice coils in parallel you will have a 2 ohm load for the Image Dynamics sub, the JL sub only being single voice coil will of course be 3 ohm.
You cannot connect them both to the amp you specified as when connected the total load will be less than 2ohms and the amp will either trip it's protection circuit or could damage the amp, My suggestion is to try each sub separately and decide on the one you like the most or obtain a matching pair for the 4ohm DVC.

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Is this sub an svc or a dvc? From what I looked up they are svc, so each sub's voicecoil is 3 OHMS, connecting them in parallel would lower them to 1.5, and your amp is capable of going down to 1.5 ohms. So I would suggest running them in parallel.

Speakers wired in parallel
Recommended Amplifier: Stable at 2 or 1 ohm mono
(Although from the information I gathered these subs have 3 OHM voicecoils, so in the diagram where is says 4 OHM it should say 3 OHM, and the 2 OHM should say 1.5 OHMS.

This is a good site to help calculate OHMS: http://www.bcae1.com/spkrmlti.htm

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Hello smoovek2008,

The JL Audio 500/1 outputs 500 watts RMS into a load from 1.5 to 4 ohms. Whether your subs have 2 ohm or 4 ohm voice coils, they should be wired in series and the subs paralleled to the amp. The final load to the amp will be either 2 ohms or 4 ohms, both of which the amp can handle. If you parallel the voice coils and then parallel the subs, the final impedance will be either 0.5 ohm or 1 ohm, both too low for the amp.

You can wire each sub to a separate set of terminals or both to the same set. The terminals are connected internally. It doesn't matter which of the +'s or -'s you use.

Hope this helps.

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Hi i wish to help u but i will need more info on the type of subwoofers u want to use -are the DVC-or single ...are they 8ohm or 4ohm speakers?

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This is a single channel amp that puts out about the same power at 4 Ohms or 2 Ohms. If you have two 4 Ohm single voice coil subs, then wire them parallel (both pos and both neg) to achieve 2 ohms. If you have two dual 4 Ohm voive coils, you want to do a series - parallel config to get to 4 Ohms (voice coils in series, then parallel the subs). Same with DVC 2 Ohm subs, series parallel = 2 Ohms. Do NOT go below two Ohms. You will blow the amp (actually, it'll do 1.5 Ohms). If you happen to have 2 Ohm single voice coil subs (not as likely) run them in series. Most amps will put out about twice as much power at 2 Ohms vs. 4, but this amp is designed to put out about the same. Hope this helps!

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