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Old 06-01-2009, 09:55 PM   #1 (permalink)
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Blown Yet Not Blown Speaker

I've gone through something of a minor nightmare since installing a pair of new Rockford Fosgate Punch series speakers in my Corolla. The speakers are the newest Punch series They were fine for a weak, then the left/drivers side started to sound like it was blown. My first thought was it was touching the speaker deck cover; took it off and the issue remained. The surround is mounted correctly. So my next thought is it somehow was blown. But here is the catch; sometimes it doesn't, sometimes it won't. Feeling the very top/rubber part on the outside of the cone when ti is doing it, the cone just stops moving like it's loosing the signal.

The head unit is a 7 month old JVC KD-S25. Not their top product, not quite their cheapest. Now here is where it gets weird; if I take the face plate off, blow it off the contacts and spray a little contact cleaner it will work fine for a few days. I almost never take the face plate off and the contacts look fine. While I plan to test the connections to the car's wire harness because I'll have to pull out the head anyway if it needs to be fixed under warranty, I kinda doubt that is the issue.

The only other possibility I plan on checking is if when I went to put larger connectors on the wires on the car's speaker mount (the contacts on the speaker are bigger than normal) is that my solder joint wasn't good (unlikely; I have a lot of experience soldering electronics in guitars and instrument amps, which are a LOT higher voltage than a car sterep and never had a problem) but something I think I'll test.

Anyone else have any other ideas outside of what I've suggested (and switching the speakers around of course)? This has just driven me up a wall. I've ruled out a blown speaker because a blown speaker stays blown sounding in my experience...
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Old 06-01-2009, 10:50 PM   #2 (permalink)
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Maybe the speakers were defective?

A speaker out it's way out may go with periodic phases between functioning and not functioning properly. A common reason why speakers blow (and I've experienced this first hand myself) is from mis-matching speaker specs to the amplifiers output. This in turn can cause a speaker to be sent a signal that's "dirty" meaning it's either underpowered (which causes clipping and moments of distortion and extreme voltage) or overpowered them excessively which can lead to the voice coils being destroyed.
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Old 06-02-2009, 12:12 AM   #3 (permalink)
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Speakers are rated for 60watts RMS and 120watts Max The heads is 20 watts RMs into 4 channels, 50 Max into 4 channels. Which I have no clue what that means LOL, and nothing I've found is real clear. All of this is at 4ohms too so I know it isn't a mismatch there. Could it have something to do with my front speakers being broken?
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Old 06-05-2009, 12:21 PM   #4 (permalink)
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I swapped the problematic one to the other side of the car and vice versa. Still doing it to the same speaker, so it's blown... at least I can exchange it, hopefully for something else.
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