I've seen external tweeters before but I've never seen an external top mounted woofer before ;\)

Vey nice set up, those mains are very close to the side walls, I wonder how much better it could sound if you were able to move them a little away, I realize you have no option, just wondering aloud.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70