Question about Infinity Reference 5350a Car Audio Amplifier

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Losing power in have a 5350a amp, when you first turn the stereo on everything plays about one minute into it i lose power to the amp.

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  • alanlnichols Sep 06, 2008

    i was running 4x 4 ohm and 2ohm sub. this unit ran fine for 4 months before the problem started. the amp was mounted under the back seat of a avalanche i'm running the correct wiring for this use.

  • alanlnichols Sep 06, 2008

    and no i'm not playing loud, i have removed it from the truck and let it set for a month now, i have with nothing hooked to reconnect it to a battery with proper wiring and after a minute i lose the power light.

  • Anonymous Sep 28, 2008

    I also have experienced the same problem with this model. It has worked fine for about a year now, but now it is doing the exact same thing. It will power up and go off, power up again and go off. The protect light never comes on. I have checked all the power, ground, turn-on lead, etc. I can only assume that it is a faulty amp. Of course the warranty just ended last month too. Oh well.

  • Kevin Murray May 11, 2010

    Have you confirmed that the amp has no power or is it just not playing music? Could you provide more info about your setup? What load is the amp connected to ( 4x 4ohm speakers + 2 ohm subwoofer etc...) Where is the amp mounted? Did you use an amp install kit with proper wire size and fusing? When it stops working are you playing it loud?



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After reviewing the owners manual I can only guess that your amp is faulty and will need service. There is no reason for the power and protect lights to both be off while the power and remote wires are active. I'm assuming of course that power is still applied and remote is activated. It's difficult to diagnose problems online without voltmeter readings but my bet is on a faulty amp. In this case it will need to be professionally serviced. Before paying for service you could check the voltage at the 12V and Remote terminals, both should be 12volts. A solid ground is obviously required but it sounds like you have wiring covered. Feel free to post any updates and I'll continue to provide options if I can.

Posted on Sep 06, 2008


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I have an early 80s roland jc 120 it works fine for about 3 to 5 minutes then it gets distorted and loses some volume any ideas where to start would be helpful thanks

Tricky one. I'm not clear if this is a stereo amp, if it is you are looking for something that is common to both channels if the are both losing volume. If it's mono, then that more of a problem. However I think it's either a IC or transistor that is getting hot a causing the problem when it gets hot! Hence why it takes minutes to play up. They best way to track it down is wait while it plays up and feel with you finger (carefully) for a part that's very hot! I should switch off and unplug before carrying this out. If there are too many warm or hot parts then the best way to track the fault down is to again wait while it acts up and with some Servisol Freezer Spray - spray the selected parts one at a time whilst the amp is running. If the sound returns to normal after spraying a part you have found the culprit!

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what will not stay on? amp? stereo?
I will give the best advice I can based on what little info I have... loose ground on amp/stereo
lose power if the amp is turning off this is a protect issue and any wire could be loose spk/por/grnd
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are you running the rest of your speakers off an amp? if so, it sounds like you have the amp remote wire connected to the power antenna wire. on some radios there is an amp remote wire and a power antenna wire. the power antenna wire loses power when not listening to the tuner (radio). usuall there is a solid blue and a blue with white stripe. the blue with a white stripe should be amp turn on.

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I'd say go back to the guy who installed and get him to do it right. He's either left some wires exposed so they are intermittently touching, or has an open connection to one of the speakers. The amp will shut down to protect itself. He may also not have wired the speakers correctly. Some systems don't work unless both hot and ground wires run directly to each speaker. Some installers run only a hot line and use the car body for ground. At higher powers this can cause amp shutdown or keep it from working at all. In any case the installation wasn't done correctly.

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Flashing Protect light

what are u using to play music??

Feb 12, 2008 | Infinity Reference 5350a Car Audio...

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