Fitted some new rear speakers cos I was not happy with the wooden sounding standard ones (basic system). What a difference,the sound now is much better,more depth and clarity the set up now sounds much better balanced. Left the small 4" ones in the bulkhead,removed the cubby holes and made 2 pieces of mdf to mount the speakers 6 1/2" dia bolted the board to the cubby hole and presto.Running the cables wasnt too bad either they tucked up under the transmission tunnel trim. As I already had the speakers the total cost was £15 for the cable.Well happy.