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Blown Mids?

Old 12-01-2007, 11:21 AM
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Blown Mids?

I brought my car to the audio shop today because I needed my sub replaced under warranty. However, the guy working there was fooling around with the amp. When I got my car back I noticed that both mids aren't working right. The tweeters were over powering them and there was no mid bass at all. I put my ear close to them and from what I can tell the mids are only playing vocals, and cannot play any Mids, no matter what settings I change. I went back to the shop and the guy said he never touched any of the connections, but I checked them over anyway and everything seems right. Anyone have any idea what is wrong?
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Old 12-01-2007, 11:38 AM
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it is either a connection issue, an amplifier issue, or a driver issue. If is it a connection issue turn the system off disconnect the speaker wires and measure resistance across the leads (either a VERY high resistance or very low resistance is bad), then measure from each lead to ground (high resistance is expected).

to test the amp feed a different driver from the amp and verify a low pass filter or a crossover setting wasn't accidentally changed. This could also have been done at the HU

a finally replace the mid in question with a different driver


my guess... they smoked it playing music too loud, or a bad connection.
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Old 12-01-2007, 02:16 PM
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Originally Posted by JohnVroom View Post
it is either a connection issue, an amplifier issue, or a driver issue. If is it a connection issue turn the system off disconnect the speaker wires and measure resistance across the leads (either a VERY high resistance or very low resistance is bad), then measure from each lead to ground (high resistance is expected).

to test the amp feed a different driver from the amp and verify a low pass filter or a crossover setting wasn't accidentally changed. This could also have been done at the HU

a finally replace the mid in question with a different driver


my guess... they smoked it playing music too loud, or a bad connection.
How do I measure resistance? And if it is a connection issue, how would I fix it?

I checked the amp and it is set to stereo with high pass on.

As for changing the mids, is it possible for both mids to blow the same time but yet still be able to play vocals?
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Old 12-01-2007, 07:41 PM
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if the mids are blown, they got to be making some funny noises me thinks.
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Old 12-01-2007, 09:44 PM
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Well is it possible for both mids to blow at the same time? I had my doubts because it happened to both of them the same time but both mids still play vocal sounds. Is this a problem with the speakers themselves or should I be looking else where for the problem?
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Old 12-01-2007, 09:58 PM
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I'm gonna guess X over point too high
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Old 12-01-2007, 10:05 PM
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Originally Posted by CanadianBronco View Post
I'm gonna guess X over point too high
I thought so too but the crossovers were not touched and there set at -3db
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Old 12-03-2007, 05:36 PM
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Originally Posted by jeffreyM View Post
I thought so too but the crossovers were not touched and there set at -3db
I think I have found the problem. The low pass, High pass switch on the amp was stuck between the two. I switched back on high pass and the mids are working again. Now I have another question. Which high pass filter should I be using? The one on the amp or headunit? As of now I have the headunit HPF set at 125, and the amp is also set to High pass.
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