I was totally surprised by my GF when she gave me a JBL CS1024 SUB and JBL GT5 A604 Amp as gift on my birthday

. She took the car and got it fitted from the dealer with out me knowing it and then in the night when we went out I was given the surprise.
As the dealer is not professional in fitting these ICE Components, I would like to know from gurus on Team BHP how to tune the amp and sub to get the best output.
The Amp is fitted under the co drivers seat but i am thinking of changing its location and put it on the wall of the boot.