^
Yup, I think if you really want them to be end tables, you'd be better off doing a sealed sub (if you need the cabinet bigger / taller, just build the sub enclosure inside the "end table", incorportate them
Think you pretty much need to go up front with the OB H/W frames.
If you turned H/W frame end tables so the drivers were facing you in your listening position, they'd just be canceling each other out as they'd be "shotting" right at each other and the front / rear of the room would be in the nulls at the cabinet sides
jay