Question about Infinity 475A Car Audio Amplifier

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Lack of power, or bad amp?

I have a 2 guage power cable running to the amp, but the lights are dim on the amp, but when i touch the rcas with a screwdriver it lights up bright and says protect, and the only time the power light will come on is when i plug the rcas into the output, and the amp itself puts out no sound when plugged into the speakers which are kappas, and i have tried wiring it many, MANY ways and still the same thing, any suggestions? or should i just take it back

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Check your ground. Its just as important as the power supply. Take off any paint, good ground means good power, check the fuse on the amp and any connctions to the battery other than that i would exchange it

Posted on Feb 10, 2009

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1 Answer

Power to amp no sound


Test your subs on another amp....If they are fine then try running different rcas in your car from the stereo to see if they are the culprit. If still no sound probably your output on your amp is gone.

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On my amp the protection light apperas when i hook the rcas up (red and white cables), i changed the leads looked at all the other leads eg power earth etc. do you have any ideas, many thanx wayne


turn down the amps gain and radio volume to lowest.

a. disconnect the RCAs at the source end. (at the head unit)
b. connect only 1 RCA at a time to the amp. ok?/fails?
still fails? u have a short in the RCA wire. toss it.

didnt fail?
a. with radio off, connect RCA to radio while RCAs are connected to amp.
fails? you've got a dead short on radio side.

does not fail? turn on radio...fails? radio is issue. (not very likely though)


my quess is that you've left out a significant observation as the probability of a shorted radio is low and you say you swapped RCAs.



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most commonly that means that somewhere there was an arc in the electrical either the pos or neg going into the amp or rcas or its the speaker wire from the amp to to the sub itself look especially for little wires touching opposit polarity wire (like a little +wire has moved and touched a - wire)

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bolt to floor board about 1/2 in. off ground run power, ground, rca, and remote wires to mounting destination conect power to pos remote to remote and ground to ground rcas to rca jacks in both cd player and amp then run 12 guage speaker wire from amp to speakers

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I have a Jensen A600HLX hooked up to Rockford 12 and it keeps getting hot and cutting off. I have it mounted on the top of the box. What is wrong?


MAKE SURE YOU HAVE A SOLID, STRONG GROUND CONNECTION BEFORE ANYTHING ELSE!!!!!
Make sure you are using the proper gauge wiring for your amp.


Is the amp set up in bridged mode? What is the impedance (Ohms) of the Rockford Fosgate 12? If the impedance of the speaker is different from the impedance for the amp in bridged mode, it WILL get hot and cut off. Also, if you overdrive the amp, the same will happen.

The amp is stable :
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  • 100 watts RMS x 4 channels at 2 ohms
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  • Also, what model is the subwoofer? What are the specs? Is it single or dual voice coil?

    You can most likely mount a cooling fan on the amp and have it turn on using the remote sensor wire. If the amp still cuts out, you're overdriving it.

    Good luck and keep me informed!
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    eyp, most of the time speaker connections blow and fuses wont stop that from happening. They are there to stop the mainboard from frying and not working at all. try running rca splitters to the operational side of the amp. run the sub on 1 channel. you will start hearing a difference but both sides will work. if not, run the splitters from the head unit and bridging it. these are the cheapest solution i could provide

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    ur rcas could b round the wrong way you might have a weak earth aswll

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    You say the protection mode only occurs when you plug the RCA's in. Does it have to be both RCAs or just one?

    The other end of the RCA cable is plugged into the HU?

    It possible the RCAs have too much DC voltage on them, causing the amp to go into protection.

    Is there a short in the RCA cable?

    I would definitely check out the RCA connection at the back of the HU, as it sounds like there could be other issues there. Make sure the RCA connectors aren't touching any other metal (especially +12V).

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    if you are using RCAs as inputs to your amp.Swap the R to L @ RCAs to see if its comming in okay from radio.If both RCAs have audio then amp is bad ,If amp has any type of switches , move swithces to see if it comes back .Also if both RCAs inputs have audio .Move the RCAs when connected on amp to see if amp has bad connection in board to RCA jacks..If audio comes back on bad side when jack is moves .Then you have bad solder joints on board..If not then you must have bad outputs on amp..

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    That depends. It could just be the guage of wire you're using. If using an 8 guage, try a 4. If the amp is running and your headlights dim, then chances are you need a cap instead.

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