Question about Kenwood KAC-X520 Car Audio Amplifier

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Amplifier installation I recently installed an amplifier in my 1989 Mustang, and everything worked good, sounded good and the sub-woofer worked well too. I then turned down the volume and started the car up, and no sound except for one speaker and even at the highest volume I couldn't even hear it over the sound of the car running.

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  • Tygh Duval
    Tygh Duval May 11, 2010

    A few questions first:


    1. Does shutting the car off cause things to work fine again?

    2. Are you using the preamp outputs from your head unit to connect to the amp or the speaker (high) level outputs?

    3. Have you verified no wires have come loose, been pinched, or broken?

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Since there's been no response in over a month, I guess I'll assume the problem was fixed!

Posted on Mar 27, 2008

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1 Answer

Subwoofer is not playing


It is hard to say. The sub-woofer has its own amplifier, although it is supplied the sound data from the main amplifier. It could have a problem with the battery power circuit (Sub-Woofer Amplifier Connector Pin 6, LIGHT GREEN/VIOLET) or it could have a problem with the GROUND circuit (Pin 2, BLACK/LIGHT GREEN) Or it could possibly not be receiving the signal from the main amplifier (Pin 7, BROWN/ORANGE "+"), (Pin 8, RED/BLACK "-"). Or it could be that either the sub-woofer speaker is blown, or the sub-woofer amplifier is defective.
There is also a "High Audio Mute" circuit that connects between the main amplifier and the sub-woofer amplifier.

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My MTX Jack Hammer JH300 Amplifier is warming up... A red led indicates that the amplifier is warming up.I checked the conections and everything seems to be ok, I've a 10" Jack Hammer JH 4510 Sub...


Check the speaker connections from the amp to the box and inside the box to the sub. Its possible these came loose from vibration. Also gently push in on the sub. It should move freely and feel spongy. If it drags or is stiff the sub may be bad. Use an Ohm meter and test the sub. There is an Ohm rating on the sub (usually 4) and it should be close to that. Also check the audio in. Maybe the amp/sub combo is fine but there is no sound going in. Use an MP3 player with a 3.5MM to 2M RCA cable as an input. Start with the volume all the way down and SLOWLY raise the MP3 volume.
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Check to determine if your sub woofers are DVC 4OHM or DVC 2OHM SOLUTION 1 If your sub woofers are DVC 4OHM then, from the positive (+) of the amplifier run your cable to the positive terminal of voice coil 1 on sub woofer 1 then continue to connect all the positive voice coils together on both sub woofers. Do the same for the negative from amplifier to all the negative voice coils of both the sub woofers. RECAP: all positives together on the positives and all the negatives together on the negatives. This will give you a 1 OHM load to the amplifier making it deliver all its power but will also run hot. So if you are living in a hot climate take care. SOLUTION 2: Connect the negative on voice coil 1 to the positive of voice coil 2 on sub woofer 1 Do the same for subwoofer 2 now you should have a free negative and a free positive on each of the sub woofers. connect the free positives together and follow through to the positive on the amplifier. do the same for the free negatives sending them to the amplifiers negative. This will give you a 4 OHM load to the amplifier. Not full power in this mode but the most stable working condition for your amplifier. SOLUTION 3 If your sub woofers are DVC 2 OHM then you only have one reasonable wiring solution. Connect like solution 2. This time because of the DVC 2 OHM sub woofers you would have a 2 OHM load to the amplifier. This is also a stable load for the amplifier and does not generate to much heat and still deliver over 50% to 70% of the amplifiers power. good luck and drop me a line if you still have doubts. dreamsystems

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1 Answer

I have jvc car audio model # kd-g335 how to connect my sub woofer?


You can not connect the subwoofer directly to your head unit. You need an amplifier installed to play the sub woofer. Asuming that there is an amplifier installed then: If your head unit has an RCA output on the rear, connect that to the LINE IN of your amplifier. Also there should be a Blue&White cable at the rear of the head unit.(amplifier remote) That should be connected the the remote terminal on the amplifier. (this will turn the amp on and off when the head unit turns on or off) Hope this helps. dreamsystems

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A 4 Gauge or even better a 2 Gauge power cable Starting from the Battery going thru a fuse block which should not be more than 12 inches away from the battery then to the battery connection on your amplifier the states 12V. A similar gauge cable connected from the GND negative (minus) of the amplifier to a good clean and cleared of paint location on the chassis somewhere in the boot (secure well) A cable connected form the blue and white cable at the back of your head unit to the remote input of your amplifier which is next to the speaker outputs on your amplifier and clearly indicates REMOTE. A stereo RCA interconnect from the output of your head unit to the line in of your amplifier. Best if there is a dedicated sub woofer output. You then connect your sub woofer. dreamsystems

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1 Answer

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after that mail again, thanks

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1 Answer

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No such thing as a typical sub system. Be more specific? If the subs are moving well and just not basing you will need to check 2 things first. Try the polatity of the speakers (reverse one) they may be out of phase and will cause the bass to cancel eachother. Another cause is the box may the incorrect size for the speakers and will not give you the correct sound the speakers are capable of. If neither of those work check your amp settings and make sure its set on sub/low frequency.

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1 Answer

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Hi There.

When you say the 40 Amp fuse blew. Was it your mains battery fuse or was it the fuse on the amplifier? If it was the fuse on the amplifier then you may have hurt the amplifier. The Kenwood KAC-8101D is a 1000 Watt monoblock amplifier. Therefore if you say that 1 of your woofers is not playing, then it is almost certainly blown if you are sure it is connected correctly. Try disconnecting it and only running the woofer that tries to play. If this woofer is still working correctly, you will notice a drastic drop if the sound of your bass. The reason for this is because you have changed the impedance load on your amplifier due to the fact that the other woofer is not working. Have your working woofer checked and replace the faulty woofer then you should be banging again.

Hope this helps!!

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