quad coils have nothing to do with the output just like dvc for additional wiring options and wiring below 1 ohm
and the box isnt as small as it looks, as its not L-box but instead with an aero port, yet it must be emphasized that properly made flared aero ports do give a better and smoother flow to air hence output, but no rocket science at all
that woofer alone is worth more than 1000$ and same for the amp :P.
Kher if any one wants custom aero ported enclosures with ports outside the box i can help, but they kida look ugly 2 me :P. And this db meter aint termlab , take out 3-4 exaggerated dbs from 150