JVC Subwoofer problem.

That would require you to disassemble the subwoofer cabinet and disconnect the the supplied amplifier.
Connecting this unit to a different amplifier would provide no benefit to you unless the on-board amplifier became damaged.

The 3 RCA type connectors (red, white,black) are all pre-amp outputs, not inputs. (Cut the girl some slack) the black is for the subwoofer. The red and white are pre-amp outputs for either up converting from a 5.1 to a 7.1 system, or for running a X.2 (2 subwoofers L &R). If you are running 2 subs, be sure on one of them to reverse the polarity.

you can get rca cable at any radio shack,they will help you get the right one

A connectivity check could provide the solution, notice any wrong wire connections on device or any other devices requiring interconnection. The woofer would perform properly when the connections that provide current for woofing are approapiate

important notes
1. Trace the connection from Recorder or sound output to the woofer device
2. The wiring connections should be sound and video ouput into sound and video output into woofer.
3. The connections if any problems would be located at the stereo recorder or device producing the spund and video. Check the connections of wires on the recorder device ensuring rewiriing
4. finally, adjust the equalisers if any the buttoms could have been disbled by master switch hindering full blaster boost sound.

Try Radio Shack.

Depending of the type of Subwoofer that required your system.

A) Amplified Subwoofer. (With 110volts A.C. cord attached to the sub)
The subwoofer electronics circuit needs repair or change.
You will find a compatible subwoofer for this type of subwoofer in audio appliance stores.

B)Not amplified Subwoofer (No 110volts A.C. cord attached to the sub)

Bring your sound system to a technician to have the soldering remaked to the devices bolted on the main heatsink.
And have the Subwoofer checked too.

This type of subwoofer can mostly be buy in kit with the satellites speakers.
And need to match thee impedance of the output of your system.

Search for ( 4 ohm or 6 ohm 8 ohm ) near the Sub outlet behind your system.

Spider Guy

Have you gone into the menu settings and adjusted the sub woofer volume, some factory settings are set @ zero.

just check out for proper connectivity of cables to back penal of main system.

i need to find the wire that connects from the subwoofer it has like little spikes inside the medal part and the spikes broke off

try to contact the manufacturer at (800) 252-5722