Question about Infinity Reference 1211a Car Audio Amplifier

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Protect light flashing/ticking

I had my Infinity 1211a mono amp hooked up to my 2.1 fared cap and 2 Infinity 12" subs and the amp worked for about a week untill it gave out and the protect light started flashing off and on and making a ticking noise while flashing unrhythmically... I left it all hooked up and occasionally the subs would kick on for a couple seconds right when my vehicle was started up but would die after that. Now the subs don't even kick on at all - not even for a couple seconds - but the protect light continues to flash. HELP PLEASE!!

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Re: Protect light flashing/ticking

Check your capacitor carefully(and connections),check your 30A fuses,u should have 4 guage wiring,if not that, pull your subs out the box, check the terminal wiring because they like to burn up before the voice coils.The coating will burn and crumble then the Small copper wire will burn up.

Posted on Aug 09, 2008

Re: Protect light flashing/ticking - Infinity Reference 1211a Car Audio Amplifier Car Amplifiers

Transistors blown, change it

Posted on May 24, 2007

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Re: Protect light flashing/ticking

I had a similar problem happen to my friends car...he had a visonik amplifier with 2 12" infinity....he had the same ticking noise and the prtect light flashing on and off....i first of all changed all the fuses...then checked the subs...and they were both blown...the ticking stopped when i unhooked the subs...try that and find out if they are blown...hope this helps...

Posted on Feb 27, 2007

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Re: Protect light flashing/ticking

Yes make sure your powers and grounds are all ok. If you have round glass fuse in the power wire replace it even it it looks good. Ive seen those fuses melt the solder internally so they will be "blown" but look as if they ar eperfect.... if that does not help your amp needs repaired. go to my website at for more info. I may be able to repair it fo ryou or buy it form you as-is...

Posted on Nov 27, 2006

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Re: Protect light flashing/ticking

This problem sound like you have too low of power going to your amp, test your battery and make sure its putting out enough power for at least the mininum amount of power that your amp requires, you can find that information in your manual or sometimes they post it on the amp itself. i hope this info helps

Posted on Oct 09, 2006

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1 Answer

Just hooked up mtx 500d mono amp and 12 inch sub worked for a 1/2 hour then sub quite and led on top of amp just flashes.

either ur ohm load is way off ur pos n neg might be touchin or more than likely u blew u sub is it scratchy when u push in the middle of the cone ? does it push in at all?

May 14, 2010 | Car Amplifiers

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Just hooked up mtx 500d mono amp and 12 inch sub worked for a 1/2 hour then sub quite and led on top of amp just flashes.

Your amp went in to power protect. You must adjust the settings on amp. This is usually very time consuming to get it right. Good Luck

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I have a pioneer gm-d8400m the amp isnt working

flashing light could mean a few different things. 1- constant power may not be there. check with a test light or multimeter. should read around 12 volts. it would be a good idea to check all the power and ground leads. make sure u have a good ground. 2- bad sub. im assuming sub since its a monoblock amp. you can meter the subs. make sure the total ohm load is no less than 2 ohms. any lower the amp will go into protect mode. 3- bad amp. power supply may be bad. the newer pioneer amps are full of protection circuits. ive been a professional installer for a shop about 8 years and we sell pioneer. hope it helps.

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Hello monkey_flea, Your subs will share the amp output. And if you are not careful, you'll end up blowing them. The amp puts out 1300 watts RMS at 2ohms, the subs have an RMS power range of from 75-350 watts, and you'll be driving them with 650 watts each. A better power match would be to series the subs to present an 8ohm final load. This will reduce the output power to a level the subs can handle. Or you could buy 2 more 12.1's and connect them series-parallel for a 4ohm load and each sub would still be getting 325 watts RMS, just about the maximum they are rated to handle. Hope this helps.

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I have a rockford fosgate p250.2 amp hooked up to two 12' subs but the amp is not powering on... instead the protect light is on and im not sure if its because its so cold outside... please help and thank...

Remove the load from the amplifier (subs) and the RCAs
If the light stays on, there are internal problems with the amplifier, and it needs to be serviced.
If the amplifier works normally, attach the RCA's and power on again.
If it remains on, connect one sub, and then the other.
Your amplifier is a 2 channel amplifier rated at
60 Watt - 4 Ohm - 2 channel(s)
125 Watt - 2 Ohm - 2 channel(s)
250 Watt - 4 Ohm - 1 channel(s)
Your amplifier is not rated for a 2 ohm mono load.
If you have Single voicecoil subs wired in parallel, you have a 2 ohm mono load - your amplifier will eventually fail.

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1 Answer

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sounds like the sub that throws it into protect mode is cross wired pull sub out and make sure they are wired right make sure ground from sub goes to ground on box and do same for power wire

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Trying to wire my amp to my subs

no thats not it you are lucky you havent burned it up like that. wire each speaker to its own source positive and negative, you loose power when you bridge an amp and use two speakers, its best to hook up without bridging you will get more volume that way.

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