Well my Tempest and the box I made myself cost $150, and it only needs about 550 wrms... probably hits harder. but its all opinion based. i saw some sony 15's hit 140+dB,so who knows
1999 SE White
AVH-P6500DVD
Infinity Reference 6500CS
Pioneer 5x7s
Punch 360a2
Punch 500a2
Adire Tempest in a custom sealed 3.4cuft box
Modded Xbox
Still need Midnight Cloth Headrests... and if somebody has fold down rear seats....