Quote Originally Posted by jeffjmr View Post
I am the fortunate owner of 4 each 288B's and 515's, and two N500C's.
This is a really bad spot to be in, I feel bad for you.

Since you have 4 515s, do you have room for an Onken W cabinet? It is quite amazing. Big and heavy, tho. Internal dimensions are 107cm x 77cm x 55cm or 42"W x 30.3H" x 21.6"D As big as an A7 on its side, plus all the thick walls. But the cleanest, best bass I've ever heard.
On top of that I'd put a multi-cell like a 1005 or 1505. Sell one pair of your 288s and you could pay for that. Alternately there is a guy in Poland making great horns at great prices. All sorts of shapes and sizes. A buddy of mine in Hawaii bought mid and high horns from him at my recommendation and is super happy with them.