Question about Jl Audio 300/4 Car Audio Amplifier

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Red light on amp

I have tried reset the groung cable and checked the fuses but the red light is still on! whatn can i do to get it working again???

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Re: red light on amp

First, double check your speaker wiring and make sure there are no shorts. Also make sure your speakers' impedance or 'ohms' are within the specs for the amp. This information can be found in the owners manual for both your speakers and amp or looked up on line. If its not right, you may have to use different speakers or change how they are hooked up. If that does not fix your problem, or the outputs were ever shorted, it may have caused internal damage and it will have to be repaired by a service center.

Posted on Nov 13, 2007

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Amp worked fine one day and the next day i get nothing. the red light on the side is on but i dont get any sound. i took the subs that were wired on that amp and wired them on the other punch 800 i have...

did you check all fuses on amp and coming from battery power wire? also check the ground and rca cables connecting to the unit and make sure the remote wire (small blue wire) didnt come lose thats usualy a sign for the red light

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I blew a pair of speakers on my 6000 watt lanzar amp the red light protection is on on the amp what does this mean

I believe it means your fuse has blown on the amp, and the light is telling you its not safe to operate the amp because it has no short protection. Check the fuse and replace if necesary, disconnect the battery for a time to reset and try again.

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1 Answer

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Make sure the red, yellow, and remote cable (usually blue and white stripes) that are coming from the radio are connected to the correct positions in the amp. Make sure amp is also grounded well enough that the ground cable does not come loose. make Sure none of the cables touch each other or the frame of the car (except for ground). Also make sure the cables for the speakers are connected to the amp and subs/speakers properly and not touch any part of the amp or other cables. Check the cables then write again if it happens again.

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Hi, the only way i can see the amp resets the stereo is that power is dropping. The amp should have its own wires directly to power/battery so as to not affect anything else.

On the protect, try to disconnet all the speakers, make sure the power is OK. If it appears to work, the there could be a problem with speakers/cables. Try a different speaker to see if it works. If the problem continues with speakers off, a different speaker etc, then there is a problem with the amp. Hope that helps

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1 Answer

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the kight is red because it isnt wired properly, try connecting a thicker ground wire then double check the fuse in amp plus in the power supply cable

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1 Answer

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Hi, what you need to do is unplug all the connections to the amp. The amp goes into protection when the circuitry over heats.\
First decrease all your gains to minimal volume.
Connect your 12+V, remote, and ground.
See if the protection light comes on then.
Next plug in your RCA cables.
Check protection light.
Then plug in your subwoofer cables.
See if you are still in protect mode.
Hopefully everything works alright again.
Just slowly increase the gain to see what the cut-off is. Make sure you aren't dropping the ohmage too low on the amplifier. Check manual for correct wiring and such.

Feb 08, 2009 | Phoenix Digital PD-394 Car Amp

1 Answer

Sony explod 800W amp

If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following.

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.

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1 Answer

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try turnning off and reset the ground, posibly blew a fuse or something and needs repair....if repairs are needed i would take it to a professional.

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2 Answers

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hi, note that if you are not using the proper gauge b+ and gnd cable with this amp then the current available at the amp wont be sufficint to keep amp on. also try using this amp while vehicle is idling. if this doesnt work then disconnect all spks from amp and check if red lite stops flashing. if it doesnt stop flashing then amp has internal fault. if lite stays on brite then proceed to check each spk load impedance, then reconnect each spk individually. the minute red lite starts flashing it will give you a clue that the channel or spk load is faulty. cheers

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1 Answer

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Disconnect all input and output cables and check. If the light stays red, it suggests an internal error. If not, proceed by first connecting the Sub wires and checking, then the input RCA's and checking. Remember to switch off the system before connecting/disconnecting, I suggest also removing fuses during this process.

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