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Think my amp is blown. (blown amp and blown speaker)

 
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IffyG
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PostPosted: Thu Jul 14, 2011 8:49 pm    Post subject:  Think my amp is blown. (blown amp and blown speaker) Reply with quote

I pulled my amps and sub out of the car before I brought it in for the transmission repair work about 2 months ago and today I finally had some time to put everything back in the car.

Just before I pulled the system I was getting a slight hint of distortion out of one of the rear speakers that I figured was just a blown speaker (my 6x9s are almost ten years old) and got around it for the time being by changing the fade settings to favor the front speakers. Unfortunately, I think that was the first sign of the amp on its way out.

I put everything back in today with the exact same settings that I had when I used the DMM to tune everything several months ago and was getting some terrible distortion out of all 4 speakers. I thought somehow the gain settings might have gotten jacked up, so I backed the gains all the way down to their lowest setting. This didn't do any good as even at very low volume levels with the gains set to their minimum, I'm still getting some nasty distortion. This leads me to believe there is an issue with the amp, but I don't know if I can rule out the stereo itself at this point.

FWIW, the amplifier is an Audiobahn A4004t and the receiver is a Pioneer DEH-P5000ub. Any advice is appreciated.

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Last edited by IffyG on Thu Jul 28, 2011 10:05 pm; edited 2 times in total
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IffyG
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PostPosted: Mon Jul 18, 2011 10:55 pm    Post subject:   Reply with quote

Alright the only other thing I could think to check was the resistance of the speakers to see if they were blown. According to my DMM, the speakers all register at ~4 ohms.

Does anyone else have suggestions before I pull the plug and buy a new amp?

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gg05impala
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PostPosted: Mon Jul 18, 2011 11:06 pm    Post subject:   Reply with quote

i don't know if this would matter, but maybe a bad ground or something?

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IffyG
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PostPosted: Mon Jul 18, 2011 11:59 pm    Post subject:   Reply with quote

I thought about that, but all the grounds seem to check out. The only other possible thing I can think of is that I wrecked the remote turn on lead terminal on the amplifier, but I was able to jam the wire in and screw the terminal in just enough to hold, so I don't think that's the issue.

I just ordered a 1/8" miniplug to RCA adapter so I can feed my iPod into the amplifier directly and see if I can blame/rule out the receiver as being the source of the problem. Hopefully I'll get that in the next few days.

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IffyG
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PostPosted: Fri Jul 22, 2011 9:18 pm    Post subject:   Reply with quote

Tested the amplifier using my iPod as the source and the cord I just got in the mail and the distortion is just as bad even at low gains. The good news is that means my head unit is probably OK, but I'm still leaning towards something being wrong with the amplifier. I've ruled out bad grounds as they are I didn't disconnect the ground from the vehicle, just took it out of my distribution block and the subwoofer doesn't appear to be affected.

Has anyone else experienced distortion out of an amplifier that's given up the ghost?

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PostPosted: Fri Jul 22, 2011 9:48 pm    Post subject:   Reply with quote

bad rcas?

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IffyG
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PostPosted: Sat Jul 23, 2011 12:26 am    Post subject:   Reply with quote

I can't rule out something being wrong with the RCA inputs, but I'm pretty sure the in car cables are fine since the other cable and iPod had the same distortion. I might see if I can find a cheap amp somewhere to figure this out.

Edit: I remembered I had an old 2 channel amp that I used to power my front speakers in one of my old cars in a box in my closet. I put that amp in and I got the same distortion out of that amplifier that I am getting with the 4 channel amp. I guess that means I have some sort of wiring issue. I checked the grounds I installed and everything seemed to snug and visually OK.

My initial thought is that somewhere along the line of getting my trans/fuel pump repairs done that they shop might have not put a factory ground back in place. Any additional insight would be awesome.

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IffyG
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PostPosted: Thu Jul 28, 2011 10:06 pm    Post subject:   Reply with quote

So my audio system hates me. I swapped in another amplifier (cuts out from time to time), but it was enough to inform me that I had a blown speaker. I put my new speakers in after work tonight and learned that not only did I have a blown speaker, I also have a blown amp. One of the rear channels is shot...

Anyone have suggestions for a decent, inexpensive 4 channel amp?

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billy101
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PostPosted: Fri Jul 29, 2011 12:46 am    Post subject:   Reply with quote

IffyG wrote:
So my audio system hates me. I swapped in another amplifier (cuts out from time to time), but it was enough to inform me that I had a blown speaker. I put my new speakers in after work tonight and learned that not only did I have a blown speaker, I also have a blown amp. One of the rear channels is shot...

Anyone have suggestions for a decent, inexpensive 4 channel amp?


Check out www.caraudioclassifieds.org

I got my amp from there and have had no issues. Very Happy
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