Jbl Sub Woofer Plug Into Standard Factory Stero

[Guest guyvtr plus]

I have a standard factory fitted car stero , but i have bought a JBL sub from that site e bay ,i have the entire piece with the speaker built in .

 

I have tried to plug it in but I cant find any factory fitted wiring loom to plug this sub woofer in . Does this extra wiring only come with the JBL up grade and I have wasted my money unless i buy a new stero.

 

Can anyone help 2.0 HDI VTR PLUS .

[skaramanga]

My C4, which has the JBL fitted, has an amplifier fitted under the driver's seat. Its not as simple as just plugging in the sub i'm sure.