Burning problem

[B&R Innovation2]

A customer of mine has presented me with a strange problem and I thought maybe one of you have faced a similar one.

This is the second alternator he has blown in his car, both powering the same JL w3's. His first setup was stock with a power acoustic farenheit 1500MAX (which is why I didn't think much about it)

Ok lets start at the top.

Headunit: JVC KDSH9700
Alt: 160a
Bat: 2 Matched Redtops
Subs: JL W3 (temporary)
Sub Amps: 2 Hifonics 1500d (only one used for the w3's now...and it blew out)
Componet Amp: Hifonics 6400z
Front Stage: CDT EF-51CV (seperated), JBL GTO Imaging Tweets, Kicker 8" Midbass Resolution
Stinger Plat 0g wiring and distribution.
All in an (eww) 94 Corisica v6

What has happened twice, the amplifiers pushing the JL's have burned out. I've yet to get a good look at the farenheit. The farenheit ran well in this installation for about 4-5 months, and then just burned out. Then the hifonics ran for about a month and half before dying. There are slighty heat stress marks on the board and metal right near where the the board connects into the heatsink.

The amp still turns on light wise and clicks out of protection...but thats it.

Its a strange coinsidence that the same car blew another amplifier powering the same subs. I thought it may have been a power ripple issue but the new alternator and new batteries should have fixed that. ON the last amp I thought the higher voltage preouts from the new HU may have caused it. But then I remember I ran it 4.5vrms from the Kenwood before, and for a long time.

Thats why I'm leaning towards a mechanical problem with the subs. But they still play well, though one of them seems to have more distortion than the other, but it's rather limited.

[DARKHART]

What is the system voltage from the alt. and batteries? Not sure about the farenheit but the hifonics amp should be able to handle up to 16.5 volts from the charging system. If system voltage is too low and the amps are trying to pull more than what's avaliable that can kill an alternator or even amp over time.

[B&R Innovation2]

It's running about 12.5 of and 14.4 when on.

[RattlinStratus]

test the subwoofers, because i fried some MTXs but they sounded fine, then again they didnt sound too good when they were new! Check all connections and grounds. Check for any wires touching, and it could be your voltage regulator depending on what kind of car it is.

[B&R Innovation2]

i've tested them on other amps and they seem fine

[B&R Innovation2]

OK ****IT

At the top I said
"This is the second alternator he has blown in his car"

I def meant Amplifier.

[mattj]

One or both of the coils are burned and lowering the impedence below what the amp can handle causing it to fry?

[Sleeklsc]

One or both of the coils are burned and lowering the impedence below what the amp can handle causing it to fry?

x2




tell that fool to lower the volume

[hardrockfan]

no ****! turn the fukin volume down!

[B&R Innovation2]

Na thats when you scrap the subs.
Thats what the consensous I'm getting at this point. And it is one of the things I assumed right off.

SO pretty much on one side of each hit it was likely putting the amp into a quick protection...and the quick *** on and off just burned it up.


Thanks guys, I think we've figured out the problem

[B&R Innovation2]

Wow good point, guess I wasn't really thinking about it. Anyways it was wired to 2ohms. That amp wouldn't even run at .5.