Amp for a JL Audio 8" W7?? - AVS Forum
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post #1 of 6 Old 03-05-2013, 03:57 PM - Thread Starter
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The sub is 3 ohm single voice coil, cause JL has to be different. 500 watts RMS.
So I need an amp 3 ohm stable around 500 watts. Would prefer consumer or plate.
Dayton makes a 500 watt plate amp stable down to 4 ohm, you think it would run the 3 ohm without problems?
Thanks for any help guys!
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post #2 of 6 Old 03-05-2013, 07:58 PM
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do you know off hand what the resistance (re) is?

Listen. It's All Good.
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post #3 of 6 Old 03-05-2013, 08:04 PM
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if this is your driver:

http://mediacdn.jlaudio.com/media/mfg/9013/media_document/live_1/8_13W7_MAN.pdf?1317790345

the manual reports dc resistance (re) is 2.78 ohms minimum. that is well within a reasonable spec for a nominal 4 ohm amplifier and is what many nominal 4 ohm drivers would measure.

jbl has the same goofy spec for their w15gti sub, so maybe it is some sort of car subwoofer marketing thing.

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post #4 of 6 Old 03-06-2013, 12:21 AM - Thread Starter
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Yeah I think it persuades people to buy the JL amps for car audio purposes. Thanks for the help!
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post #5 of 6 Old 03-06-2013, 09:53 AM
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Yesterday, I bridged my Crown XLS2500 to see how the crown would hold up to the 3 ohm load of the 10W7, as well as, the 10W7 getting 2400 watts of potential power. I slowly turned up the pots on the Crown amp until I felt safe and they both held up well. I played some clips from one of the Transformers movies and all was well except for a spot where it clipped really bad but luckily for me it was only a sec and appears to have not done any harm. I did this test as I noticed in WinISD impedance graph showed the sub to be above 4 ohms from 12Hz to 70Hz and sure enough there was no problem. smile.gif You can model the 8W7 in WinISD to see if the results are similar.
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post #6 of 6 Old 03-06-2013, 12:20 PM
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Any amp that will run 4 ohms will be able to run 3 ohms.
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