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Old 01-17-2011, 02:25 PM   #1
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Subwoofer keeps blowing for unknown reason...

I've had a subwoofer installed in my trunk. I blew a type r in 2 weeks and a P2 in 2 hours. My audio guy has checked everything. He's installed many systems over the years and the only thing he can guess is that my stock boston acoustics system is sending the wrong signals (highs and lows and all that) and it's confusing the woofer to where it doesn't know what to do. Anyone else have this problem?
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Old 01-17-2011, 03:36 PM   #2
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That's not possible to blow it "because it doesn't know what to do". The crossover sends only low frequencies to the sub and sub amp. You are probably over driving the amp, and that distortion is cooking your subs. What amp is driving this sub?

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Old 01-17-2011, 06:21 PM   #3
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Yeah it's not the signal the amp is getting, something's not set right or the enclosure isn't built correctly.

I have 2 Type-R's and Ive beat the hell out of them overpowering them and all, and they still work flawlessly after ~7 years.
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Old 01-17-2011, 06:25 PM   #4
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Quote:
Originally Posted by G.E. View Post
I've had a subwoofer installed in my trunk. I blew a type r in 2 weeks and a P2 in 2 hours. My audio guy has checked everything. He's installed many systems over the years and the only thing he can guess is that my stock boston acoustics system is sending the wrong signals (highs and lows and all that) and it's confusing the woofer to where it doesn't know what to do. Anyone else have this problem?
What amp? Are the subs and amp impedance matched? My guess, gain/boost are both too high, you are overdriving the sub and popping it.
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Old 01-18-2011, 12:19 AM   #5
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you are blowing subs... its been a long while since I blew up any subs, but exceptionally distorted signal, WAY too much power, no subsonic filter set, exceeding mechanical limits of the sub (too much power/vented enclosure), hmm... subs are shockingly forgiving when it comes to too much/too little power as well as dirty/clipped signal.

What are the chances that your amp its self has a fault and your throwing straight DC current into your VC's whenever the amp shorts?
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Old 01-18-2011, 12:25 AM   #6
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you know i am with many on this. but i think you have the wrong settings. your gain is to high and maybe the impedance is not matched.

only reason i say that is cause back in the day i blew out two fosgate 15' subs within an hour. my amp had plenty power i was new to the whole thing and i would always turn up the gain and not set my fregrency. so check that stuff out.

if those are down and set right then i would say you have a bad amp
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Old 01-18-2011, 07:15 PM   #7
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i have an Alpine M500 amp. i blew a 12" alpine type r in 2 weeks and then just recently i blew a rockford fosgate P2 in 2 hours.
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Old 01-19-2011, 01:46 PM   #8
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i have an Alpine M500 amp. i blew a 12" alpine type r in 2 weeks and then just recently i blew a rockford fosgate P2 in 2 hours.
well again that amp is fine for both those subs. what you need to check is what ohms you have the sub at and what ohms the amp is. if they are not matched that could cause damage.

now another thing like posted earlier is if you have your gain up to high or the frequency is not set right you could be distorting the subs and that is causing the subs coil to fry. so i would check all that. or if possible post up here the settings on the amp.

just checked the features on the amp, its 2-4 ohm stable so as long as you run the sub at 2-4 ohm you should be fine. only difference is 2 ohm is more power then 4. so post here your settings and what kind of box you have and i might be able to help you.
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Old 01-19-2011, 02:50 PM   #9
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Also if the subs are dual voice coil, if they are wired wrong, they could fry the coils as they would be working against each other.
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Old 01-19-2011, 03:54 PM   #10
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both are the 4 ohm version of the speaker and i had them paralleled wire to run at 2 ohms off the amp. i'm not sure what the amp was set at but i know it was rather low because from my understanding, the subs need a break in period before you really bump them.

the box is a custom built box.

also i'm not sure the coils are the problem, as in i dont think they are frying.
what's happening is (i guess the cone?) is coming unglued. but i could be wrong on all that.
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Old 01-19-2011, 04:03 PM   #11
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You can also blow the sub if you cause the amplifier to clip
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Old 01-19-2011, 04:04 PM   #12
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Quote:
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you are blowing subs... its been a long while since I blew up any subs, but exceptionally distorted signal, WAY too much power, no subsonic filter set, exceeding mechanical limits of the sub (too much power/vented enclosure), hmm... subs are shockingly forgiving when it comes to too much/too little power as well as dirty/clipped signal.

What are the chances that your amp its self has a fault and your throwing straight DC current into your VC's whenever the amp shorts?
This is what I would think as well.Try taking an O'scope measurement from the output,or a DC multimeter measurement.
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Old 01-19-2011, 07:27 PM   #13
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If they are separating/coming unglued, that's a first I've ever heard of that happening, and I've installed 100's of subs in my 10+ years in the business. Only time I've ever seen a surround separate was a really old sub where the glue dried out, or a defect in manufacturing, and all combined I've only seen a handfull.
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Old 01-19-2011, 10:04 PM   #14
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the amp will only run at a 2 or 4 ohm depending on how you wire the subs. if you ran them at a 2 ohm then the amp will run 2 ohms.

now i am confused as to what you are saying. the center cone is separating? we will need some pics. also is there any way you can describe what your sub is doing that you are saying it is blown
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Old 01-20-2011, 02:37 PM   #15
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Just some food for thought.....

(1) try setting your crossover to 80-90hz; (2) keep the bass boost dial turned down and only adjust your gain... In my opinion, our cars already have enough cabin gain. Using bass boost turns everything boomy and muddy. I highly recommend about 1/2 on the gain if you're driving the amp straight off the headunit output. Do this and your amp will: (1) clip much less and (2) clipping, if it happens, should not rise high enough to permanently damage your drivers. Oh, and a subsonic filter (basically a high pass filter of 15-20hz) would be a good thing for any sub install.

The premium system headunit puts out something like 5volts AC for the music signal-- it also has a 6volt DC ground loop signal present that "should" be killed with a ground loop isolator. If the amp hasn't died yet, then apparently its ok with the 6vdc?

Also, C5 user TeamTCA (a past World Champion in SQL) has discovered that the headunit's built-in equalization (even if adjusted flat) is no where near flat, and is tuned to the factory speakers. Not necessary a good thing for aftermarket amps and drivers. The worst part of the factory EQ is a significant mid-bass peak of 200-300hz and is high enough that no one (who's tried) has been able to completely eliminate it. I mention the mid-bass peak because if you're crossed over too high, this could be one of the causes. 200-300hz is within vocal range of some men, non-digital drums, and horns. If you hear any vocals in your subs at all, you're crossed way too high.
Good luck!
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Old 01-20-2011, 03:38 PM   #16
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There are details to this that we are all missing... we need more information to be able to help diagnose the problem.

Details on how/what is "blown"
Details on environment - is it wet? dry? hot? cold?
if possible, snap some pics and post them up...

I am beginning to lean toward the enclosure as the culprit - enclosure problems are the only things I have seen tear a good woofer apart, though I have seen lots of environments (wet for example) damage them.
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Old 01-20-2011, 11:24 PM   #17
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A few years ago I remember alpine having an issue with a batch of type r's that had gotten a bad batch of glue and were coming apart. If you have a old type r (before the ridged rubber surround) that could be the issue. What is the source unit. Dirty signal in makes horrible signal out of the amp. Subs dont blow because they are "overpowerd". Remeber you are dealing with signal and if the signal is not clean than you get distortion and then a blown coil. If your running a 12" sub set your crossover at 60 hz and see if that helps. Like others have said we need more info and pictures would really help.
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Old 01-21-2011, 09:54 AM   #18
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Cone coming undone could be bad glue as previously mentioned, but it can also be caused by beating the sub to death. That can be done several ways...

Enclosure too big for sub, power applied. It's going beyond it's mechanical limits.

If it's porter, and you aren't running a subsonic filter, you are dropping below tuning frequency, unloading the sub, driving it beyond it's mechanical limits.

You are just flat over driving the sub. Too much power plus constant cranking on the volume knob, driving the sub beyond mechanical limits.

And combo above, and faulty glue. Although two different brand subs doing the same thing? Leads me to believe it's in the system/user, not product, although that's not impossible. Needs complete details of system, with pics of subs, amp settings, to be sure.


Jslim....you can't blow a sub by overpowering it? Really? Just what do you think clipping an amp is? That square wave is twice the power of a sine, and if that power is within the rme power handling of the sub, it'll eat it all day long. Distortion, square waves, only kill if it goes above what a sub is rated for, and then it has to be maintained for awhile. Almost all subs can handle twice, maybe three times their rms,hence peak ratings, ratings for brief moments. That's the beauty of music, it's dynamic.

In any case, if you don't think you can't blow a sub by overpowering it, you haven't played with enough power. Try this, plug your sub, free air, into a 110 outlet. That's a 3600wrms sine wave, roughly, at 60hz. Very few subs can handle that. Some even get on fire, so do it outside, lol!
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Old 01-21-2011, 12:21 PM   #19
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Some even get on fire, so do it outside, lol!
heheh used to do that to swap meet tweeters in high-school... the smell is HORRIBLE

The first time you light a sub on fire in your car is similar to the first time you kiss a girl... slightly terrifying, something you'll never forget... and it rarely goes well

*sniff* makes me miss my old Orion HCCA amps and that fateful day that I lost a very close friend... an M&M Godfather 15... *sniff* :(
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Old 01-21-2011, 08:06 PM   #20
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You need a new "audio guy". That's all there is to it.
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Old 01-21-2011, 11:38 PM   #21
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heheh used to do that to swap meet tweeters in high-school... the smell is HORRIBLE

The first time you light a sub on fire in your car is similar to the first time you kiss a girl... slightly terrifying, something you'll never forget... and it rarely goes well

*sniff* makes me miss my old Orion HCCA amps and that fateful day that I lost a very close friend... an M&M Godfather 15... *sniff* :(
My favorite was one of three ID SPLs that were handbuilt for a friend in DB Drag. I got a hold of the subs when Shane was through with them and plugged one into the wall. We got a full 30 seconds of watching that monster dance across my garage floor before it locked up! It was freaking awesome and loud!
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