JL 10w7 burning coil

[lindin5]

I have a 10w7 hooked up to a 1000/1 in my car. The amp is turned down, and doesn't seem like it should be too much for my sub. Me and two different car shops have looked at it. I have broken 3 subs in, and every time i go to turn it up i get this smell, and then it just gets worse and worse. I have taken each one to the store and found out that my coil is burnt to a crisp. any idea why this might keep happening?

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[ThatChevyGuy 5,000+ posts]

Are you sure your amp is turned down? what enclosure?

 

[shakinghorizons]

Too many amps running through the coil is creating heat. What ohm load you got it wired up to?

 

[lindin5]

its in a costum box in my trunk, its at 3 ohm

 

[DNick454 10+ year member]

just because you "think" that you aren't pushing them that hard doesn't mean you aren't. Too many times I've seen people come on here and say "Well, my gains were only at half." Which is not correct, because even though the gains are at half, the headunit may send a really strong signal, like maybe 6V-out or the bass boost or bass settings on the amp or head unit are maxed. That would cause your amp to clip, and if you're amp is right at the RMS rating of the woofers, THAT + clipping would toast your coils.

 

[lindin5]

if i got another 10w7 up to that amp would that solve the problem?

 

[shellfish 10+ year member]

yea just because your gain is set 50% doesn't mean your amp is putting out 50%

rated power. What size enclosure?

like two? not if you keep sending them clipped signal.

 

[NightDrifter05 10+ year member]

If you are clipping it then the only way to fix that problem is by setting the amps settings right. I would suggest having your gain set properly since that's probably the problem.

 

[lindin5]

the box is around 2 feet by 1.5 feet, i dont have a ruler so its not exact

 

[ThatChevyGuy 5,000+ posts]

a custom box, whats it tuned too, or is it sealed?

 

[lindin5]

its ported, i dont know what it is tuned to, ultimate audio did it for me

 

[DNick454 10+ year member]

if i got another 10w7 up to that amp would that solve the problem?

Well if you're current one is burned out, then adding another wouldn't be solving the problem. JL has a great guide to setting your amplifier gains with a digital multimeter, but to be truthful, you can really just do it by ear. I mean, there's a point where adding more volume just doesn't get louder, you start hearing distortion, so back off the gains so that when you're headunit is at about 75% volume, there is no distortion.

The W7 is 1000W rms and that 1000/1 should be powering it perfectly. Those woofers can even handle more power if it's a clean signal. So the only way you could be burning up those coils is if the woofer was defective to begin with, or more likely, you're sending them clipped waves.

 

[DNick454 10+ year member]

its ported, i dont know what it is tuned to, ultimate audio did it for me

Don't take this as being offensive, because it's quite common. But the first thing most people with systems that they have had someone else install for them, is to turn up the bass settings and/or gains. Again, it's a common mistake, everyone does it with their first system because they don't know better. But that very well could be the cause.

 

[lindin5]

Well the 10w7 only pushes 750 watts by itself, and i dont hear any distortion when i turn it up

 

[AlterEgo99 5,000+ posts]

May I suggest: http://www.ls1tech.com/forums/stereo-electronics/1120297-how-set-your-amplifiers-gain-right.html

Get a DMM, set it for AC and see what you are getting for voltage at the speaker outs...based on what is happening I think you may be surprised. //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif