Just to ask the question since it hasn’t come up yet, how much space are you trying to fill. What SPLs are you trying to achieve, and what’s the budget?
The Danley J3 sounds great and is a one-box wonder, although rather large and heavy. As already mentioned, at a smaller level the RCF TTL6a can do a neat trick of arraying 2 boxes vertically. The Yorkville Synergy system looks interesting (I have yet to hear it), but it seems to be painfully expensive and limited for what it is and how it must be used. Hope this helps!