with a crossover..u can tune ur sub and comp set in the cabinrattan said:No my amp is now under my seats, so i want to put it at the back coz easier to change in future n also easier to tune the amp, the shop fello said hv to put new wiring coz the current one not long enough. Normally how much will the wiring cost (witht the wires) to pull the amp wiring right to the back of the car boot for wira SE.