Thanks. I decided to check my speakers to see if there is a port and apparently there is a passive port at the bottom of the OM 10's above the speaker connects. Never knew it was there. That being the case my guess is a downward firing port is going to be the problem with this amp.
Next question for anyone that has the answer. Will adding a wood veneer "sock" over the bottom of the BP 6,8 or 10 below the drivers without covering the rear port affect the sound in any way? I would glue the pieces together and slide it over the speaker without actually attaching it to the speaker. It could either be snug up against the speaker or I could leave a little space on each side, say a quarter inch or more if it won't affect the sound.