Question about Alpine 12" Single-Voice-Coil 4-Ohm Subwoofer

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3 subs in one month.

I have gone through 3 Alpine e 12's in one month, the first one I bought lasted about a week and then just died, didn't blow, died. Exchanged it for a new one, same story, about a week later it was dead. I tried once more, having nothing but good stories and experiences with Alpine in the past I was hoping it was just a bad batch. This one lasted just under a month, then same story. I had the subs in a single sealed box with an MTX RoadThunder2160 450watt max 225 RMS amp, which like all amps will overheat but i have never even blown a fuse on the amp, it pushed a JL Audio 12 for over a year without a problem, why are these alpines dying on me left and right?

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  • Nathan Bardo Jun 25, 2008

    would adjusting the high pass filter in the reciever help to prevent these subs from frying out? With my JL I kept it at a constant 125, and it never had a problem, but with the Alpines I pushed it down to 80 and never even thought about it, or would the eq on the amp be pushing too many high frequencies? And what is this scope you talked about?

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  • 4,234 Answers

When you say these are dead, is the voice coil open? If so, the easiest way to fry a coil is to send it high frequencies that it can not reproduce or to send it a distorted signal. If you know anyone with a scope, scope the output when you have it running. Normally the low end will be a relatively smooth curve. If the curve is made up of a really jagged line, you may be passing harmonics through the amp that can heat up the coil causing it to fry. Check the output of the amp with a volt meter. When cranked up you should get no DC voltage at all. If there is DC, that too will do nothing but heat up the coil.

Keep us posted.
Dan

Posted on Jun 25, 2008

  • ABRsvcs Jun 25, 2008

    80 is fine. There is something else going on. When you exchange these speakers, do you get any idea of what failed in them at all? That would help to determine the cause. Check the terminals of the amp for DC voltage. That is where the problem resides I suspect.



    Dan

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