Each side of the car carries its oen signal from the hu to the underseats then on to the doors
You will have to tap/build a connector BEFORE the underseat enclosure as i believe there is a high pass contained on the 6.5" woofer
FS:Sub Amp - works w/ Technic harness! MRD-M300 - cheap
DON'T BUY FROM RAF555!!!! Promised fix! - strung me along til Paypal dispute period expired!