i just got a clarion xw1500 15" sub and a clarion APX400.2 amp, the sub is in a sealed custom box and i was wondering if this setup was good for AU$450 which also includes the box wiring kit and install and if this is underpowering the sub? it sounds good with deep strong bass but it isnt punchy, can this sub mess with your heart beat or is this the best im gonna get? i dont hear much bout clarion subs are they ne good?