One rca jack for subwoofer (jvc kd-avx44)

very good ! there is nothig wrong with your system, buy a stereo to mono RCA jack (Rs10/-) and connect the subwoofer (if single coiled) L+ & R-- of your existing amplifier. NB: Please go through the manual of amplifier
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Sounds like there is a problem with the amp. Try switching the inputs around for that output on the amp. If that does not help, Yes I would have to say that there is a problem with the amp output circuit.

Check a few things. Make sure the head unit is getting power. Then make sure that your RCA cables are connected to the right output RCA's fromt the head unit. If this is ok, check to make sure the RCA cables didn't get crimped somewhere. If this is still all ok, check the volume on the unit and to see if you have the unit on mute. Sometimes it's little things like that. Did you adjust any settings to the amp? If so, check the gains. Hope this helps.

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

How do I install a set or a sub to this head unit with only one wire output marked sub,I'm not sure if may amp will play correct.

Hello herb31,

It sounds like there is a difference in the signal levels on the inputs to the amps. You did not specify what the RCA's are connected to on the head unit side. If they are connected to a stereo pair of preamp outputs, you may be able to solve the problem by using only the channel with the higher signal and use an RCA "Y" adapter to split it to both amps. If they are connected to a dedicated subwoofer output on the head unit, make sure that the head unit is set for "subwoofer". Some less expensive head units, I know JVC in particular, has only 1 set of line outputs and requires you to go into their "PSM" (Preferred Setting Mode) to set the line output mode and if you select "subwoofer", then allows you to select the low pass frequency.

If you are converting speaker-level outputs through a "line out converter", check both the input and output levels.

Also, if you are splitting an output from the head unit, you still need to connect 2 RCA's to the amp inputs. The signal will be properly split if you use a 1-female to 2-male "Y" adapter. To feed the same signal to both amps, you would need 3 "Y" adapters. Feed the output signal to the female end of the first "Y", and plug the male ends into the other 2 "Y" adapters. Then, the 4 plugs you have left on the ends go into your amp inputs.

Hope this helps.

Subwoofer signals should be MONO - not stereo (hence the single Component out on the radio)
Only use one RCA to send signal to your amplifier.

If you use a Y splitter - the signal voltage will be cut in half - deteriorating the quality, and therefore amplifying "dirty" signal.

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Please check your model number, I can not find it on the JVC service website.

This is a powered sub-woofer I think. You need to have a thick black cord that connects the sub to the head unit. Then the satellite speakers get connected to the speaker jacks on the sub-woofer box. The sub-woofer should also be plugged into an A/C outlet on the wall.

The speaker outputs are labeled right there where you connect the speaker wires. You should see a red and black connector for each speaker and they are labeled "front right" "front left" "center" "rear right" "rear left".

If you do not have the thick black cord you need to connect the head unit with the sub-woofer, you can not use this system.

If you look at the head unit and give me the model number on it, I may be able to find the part you need. But I must have a good model number to work with, preferably from the head unit.

Dave

The JVC-G331 should have an auxilary output on the Back (red & White) run two Stereo RCA cables from this output to the input on the amplifier, then you're ready to go! ;)

Oh yeah, make sure and run the RCA's on the opposite side of the car as the power wire (most likely 4ga) or else you could hear interference.

Even if your JVC doesn't have outputs for a subwoofer you can hook it up with the a speaker wire to RCA converter. You just spice your rear speaker wires to this device then connect RCA's to your amp. I've used them before... works great. http://cgi.ebay.com/ebaymotors/Speaker-to-RCA-Line-Level-Converter-Adjustable-High-Low_W0QQitemZ130143832174QQihZ003QQcategoryZ38636QQcmdZViewItem