Wait till your son hears Ian's new ribbon design that will have quad opposed 10 inch subs (2 per side), a 1600 watt subwoofer amp ... Quad 6.5 inch woofers - Triple 5.25 inch mids front and back and a new, Colquhoun Labs Ribbon Tweeter array front and back.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated