sorry i disagree
first of all
amplifier shouldnt be attach to that board where woofer is attached
as it was in website , bcae1.com
that severe vibation can damage amplifier by lossening electric components inside your amplifier
2ndly
u need to separate woofer compartment and speakers from each other , air push and pull by woofer is toomuch , which will effect ur speaker cone too much , that will cause distortion and it can burn speaker voice coil when speaker will try to pull cone and woofer will push its cone ,
3rd , air will be leaking from several corners ,the SQ will be not to much good , will be loosing punch and bass line
4rd : get proper wiring for speakers
5th : ur stuff is good to enjoy bass and midrange / treble
but make whole stuff in right position to make best sound system