Sorry Bob, must have missed that post, The LF speaker I think you are refering to, is 2.5 - 3 inches away from the plumbing wall that sticks out from the side wall, the rear of the speakers are also about 2-3 inches from the fireplace hearth and side walls leaving them about 6 inches away at the ports.

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