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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  • 21 Answers

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

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.



May 08, 2011 | AudioBahn Car Audio & Video

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Battery light & brake light flashes on & off. went to parts store & had battry & charging system checked. was told battery was bad , bought new one .problem still there not as bad...


You need to get a volt meter on it. Your battery should be around high 12 to 13 volts while not running, and increase a little without going over 14 1/2 volts running.

Aug 11, 2010 | 2007 Nissan Titan LE

1 Answer

How to install


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

Oct 15, 2009 | Kicker ZX400.1 Car Audio Amplifier

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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 :
  • 75 watts RMS x 4 channels at 4 ohms
  • 100 watts RMS x 4 channels at 2 ohms
  • 200 watts RMS x 2 channels bridged at 4 ohms
  • 300 peak watts x 2 channels bridged at 4 ohms

  • 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!
    Ed the Whizman

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    What could be dragging my battery down after 2 days of not starting it?


    Lots of stuff. An after market alarm,malfuntioning radio,bad battery,bad door pin switch for the interior lights. Best thing to do is charge the battery if it's in fact good, thenunhook the negative battery cable & connect a test light from the disconnected cable to the negative battery post. If it's a nice bright light it's got a draw. If it's really dim,that's the memory for the computer,anti-theft,radio memory. I mean dim,like barely lit! That's ok. If you don't have a test light disconnect the negative cable & touch it to the negative battery post a few times & if there's a big spark,there's a draw. If there's a draw & there's nothing on in the car,like an interior light,etc, than start with the inside the car fuse box & while holding the open door pin switch test each fuse for power. If anything has power that shouldn't with the key off that's where to start. Do the same for the under the hood box as well but disconnect the hood light. If you are using the Viper alarm system,junk the system. That alarm causes your problem & in alot of cases a fire.

    Jul 22, 2009 | 1995 Chevrolet Camaro

    1 Answer

    Protection Light Is Coming On


    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).

    Mar 14, 2008 | Car Audio & Video

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    Adding 2 extra channels to pair a MC7205 with a MX119 pre/pro


    Yes, you can connect the MX119 'Multi-Amp' output connection to the MC7205 using a 'Parallel' 25-pin cable. It will send Front_L/R/Center/Surround_L/R signals (5 total) to the MC7205, then use a separate pair of RCAs cable to connect the 2 back-surround signals to another 2-channel amp and you are all set.

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    1 Answer

    Right side speakers don't work


    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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    4 Answers

    Power supply


    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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