Question about Infinity Reference 611a Car Audio Amplifier

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Infinity 336rms amp worked for over a year then one day stopped?

I was driving one day and listening to music low and then all of a sudden the amp just stopped working? can anyonehelp me with it i took it apart to see if it fried but found no spots that looked fried

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Check your fuses. Also check the power wire connection to the amp and then the ground source maybe move that if there is paint under it. check fuses on the amp. Check ohm load to the amp from the speakers.

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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Music plays for a while, depending on the weather and how hot it is and then it just cuts off and the protect light comes on. Had this amp for 4 years and no problems till now. Some days I can listen the...


check the cooling fans inside the amp i suspect that they are not working properly and this causing it to overheat which will shut it down via a thermistor to prevent damage

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Does it display any message like "Protect" or something similar? Do you hear a relay click on then off?

Did the amp just not power up one day or did it stop working while you were listening to it? Finally, do you have teenage kids who might have been listening to your receiver and would have "neglected" to tell you that after listening to their music it suddenly stopped working?

It could be an internal fuse but chances are its something that requires a technician to repair (like the output transistors).

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you have wires grounding out at the back of the unit. i suggest trying to completely rewire it and see how that works. its easy if youve never done an install so dont sweat it. email me if you have any questions.
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First things First!
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It seems like both times the problem started when the speaker got unplugged without it being shutoff first, but I can't confirm.

But if your light is still on it's probably a different problem. With my 4.1t towers when the light was on but there was still no sound it equated to numerous fried amp components which cost about $150 for repair.

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Check the physical condition of subwoofer to make sure that the surround has not rotted out or been blown away. If ok, then using an ohm meter check for the nominal speaker voice coil resistance to make sure it is within spec. If both of these areas are good then you have destroyed the output stages of the amp(s) driving them. Every 3 db of bass boost doubles the output power. So if you are blasting along at 100 watts and you jack up bass by just 3 db the amp now has to put out 200 at those lower frequencies; go up by just 6 db and you are now talking 400 watts! And what does that do to an amp when you over drive it? You guessed it!

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Has the amp been overheating lately? It's quite possible that the amp could have just blown. Smell around the outside of the amp for an electrical burnt smell. If available, see if a friend also has an amp hookup and try removing your amp and copnnecting to the friend's cables. That will tell you if it's a wiring problem or an amp problem.

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