Question about Infinity Reference 1211a Car Audio Amplifier

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Car amplifier the protect comes on as soon as the music reaches a certain volume. i replaced both fuses on the amp and checked the ground wire and nothing is working. any suggestions?

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(nothing is working???) check speaker config too low imp will do that.

Posted on Aug 22, 2007

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1 Answer

When i put on power protect light come on


If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible causes, do the following. Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still shuts down (goes into protect mode), the amp almost certainly has shorted output transistors and will need to be repaired. If the amp only shuts down when it's driven to relatively high volume, you need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts on either the B+ or remote line, you need to check the wiring feeding whichever line is too low. If 'both' the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.

Dec 15, 2010 | JBL BP1200.1 Car Audio Amplifier

1 Answer

Amp wasplaying red light came on and won't go away i check ground and it is good


The red light is a power protection circuit designed to shut the amplifier down due to an overload or wiring problem. If the amp was playing then shut off, my guess is a problem with the speakers or the speaker wiring. Some amplifiers are only stable to a certain load. For example, most car audio speakers are 4 ohms which is the resistance placed upon your amplifier to produce a certain volume of sound. If you bridge two 4 ohm speakers together in parallel, you cut the resistance in half, thus increasing the amount of power (and volume) to your speakers. This also creates more heat and could, in effect, shut your amplifier down. I would find out how the speakers are wired to determine the resistance of the load your amplifier is pushing.

Jun 20, 2010 | MTX Terminator TN400/4 Car Audio Amplifier

1 Answer

Amp


I honestly don't have a solid answer for you. I can say check your fuses. Check your battery to amp wire. And also check your ground. Make sure the fuse on your amp is also not blown

Feb 26, 2010 | Alpine MRV-1507 Car Audio Amplifier

2 Answers

My amplifier turned off while playing and wont turn on at all now


Hello, it sounds like you shorted the outputs of your amp or the power supply mosfets shorted. Very common when people have the music at a loud volume. Does the protect light come on? If not then the power supply is probably shorted not letting the protect circuit get any voltage. Some amps do this and other amps if the power supply shorts have the protect cicuit built in such a way that if the power supply shorts out the protect circuit still works. Cause you checked all wiring and redid it and no fuses blew then this is your problem. I repair amps everyday for a living. ?Most of my out of state customers are from fixya.com. I'm the cheapest amp repair business you'll find. If interested send me a private message letting me know what kind of amp it is, name and model number, and i'll get you back up and running with warranty.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

Aug 23, 2009 | Car Audio & Video

3 Answers

Amp overload protection mode


it sounds like the ground is bad to begin with and check the positve cable for oxidisation on the battery terminal and at all other places that the power wire is connected to

Aug 09, 2009 | Kenwood KAC-8104D Car Audio Amplifier

1 Answer

Protection light comes on when amplifier is hooked up


If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following. I'll assume that you've checked the amplifier's on-board fuses.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp almost certainly has shorted output transistors and will need to be repaired.

Sep 15, 2008 | Kicker KX600.1 Car Audio Amplifier

1 Answer

Protection light coming on and amp cutting off


yes make sure there both connected properly, check the fuses, the protection light usualy comes on when there is too much power and the amp protects itself from blowing

Jul 16, 2008 | Car Audio & Video

1 Answer

Protect at high volume


No such thing as too much power unless you have a faulty alternator/voltage regulator.
The hundred amp fuse at the battery is better than none but I would replace it with a 50 Amp, that fuse is really only protecting the power wire from grounding out and burning.

The gains are irrelevant, all they do is attenuate the input.
Set them so you cant hear any amp hiss or noise on quiet passages of music or between tracks.

Make sure your not starving the amp for power. Start at the battery connections and work your way back to the amp, inspect all connections for corrosion and make sure they are tight.
Check the ground wire . It is just as important as the power wire!! Try to ground it as close to the amp as practical, scrape off the paint down to the metal use a oversize screw with a star lock washer and a ring terminal.
Make sure that your power wire and ground are at least 8 gauge.

Next on the list is your speakers and related wiring, check to make sure that your impedence is not too low for the amps rating. and that the wiring is correct and at least 16 gauge, 12 is better.
. You can check the speakers impedance with a Ohmmeter, it wont be exact but it should be close +/- .5 Ohm If you are bridging, make sure the speakers are wired in parallel + with+ and - with - .check the amps rating and bridging configuration, it's normally left positive, right negative, but check!

Having done all the above, and you still have a problem only two possibility's left, Defective speakers or the amp. Check with a qualified installer, buy him lunch, you'll get good advice forever.
I hope it helps. Regards Paul

Jun 11, 2008 | Lanzar VIBE266 Car Audio Amplifier

1 Answer

Protect on car amp


If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following. I'll assume that you've checked the amplifier's on-board fuses.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp almost certainly has shorted output transistors and will need to be repaired.

May 17, 2008 | JBL GTO75.4 Car Audio Amplifier

1 Answer

Amp blowing fuses


The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

Nov 22, 2007 | Rockford Fosgate p-450.4 Car Audio...

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