Stacking

Thank you for your post.

I think I'll have to buy a bigger home. LOL

I would never stack speakers on top of subs!! Way too many vibrations going both ways. If space is limited put the subs next to the speakers or stuffed in the corner of the room. Put them next to a couch or chair and stick a lamp and a plant or some coffee table books on the subs. Blocky end tables. 

@danmar123 Wouldn't smaller subs remedy the need for stacking?

From what I've been gathering is, I would need a larger sub than the Tuba 24. People have been suggesting the table Tuba. With that unit, I haven't any room upfront. Right now my LaScalas are 9.5 center. If I add the bass units up-front, that would make the LaScala s 7' on center. That would be my best bet ,I guess. 

Right now, I have not run all HT wires under the floor, so my subs are stacked in the corner. It works, but it's not optimal. DSP helped, but they need to be moved. 

What did help was putting isolation pucks under both subs, decouple the subs from each other and the floor.