Audi A6 (c5) JL Audio 12w6v2 System, Alpine ida-x305, PDX 4-150, Focal Kr K2

Any Advice to improve system? Thanks for watching. All Tech Info: Camera: Sony HandyCam HDR-SR11 Car: Audi A6 C5 Head Unit: Alpine iDA-x305 Sub: Jl Audio 12w6v2 @ 4ohm AMP: Alpine PDX Focal 165Kr K2 (Front) Jl Audio C5-650 (Rear) AMP: Alpine PDX 4-150 Tracks: Young Jeezy ft Kanye West - Put On Lil Wayne - Brand New