Thanks Bill! No fibergass experience so...hello 6X9's on the bulkhead. I had old Altec fiber cone 6X9 coax speakers in the wedge type boxes on last boat and they sounded poor. Not enough internal volume in box I think. I tried adding internal damping foam too and still sucked(no low end). Tossed the boxes. Tried them in an infinite baffle arrangement and presto...sounded decent.