One more thing, the Gaia's come in sets of four. I ordered three sets of Gaia I's and did both of my sets of SS-10's with them through a Colorado company called Listen Up. I got a 20% RMAF discount and that made each speaker set cost $750. Expensive, but I wouldn't give them back for twice that. The sales person I used was Scott Genaw. If you found someone else that wanted to go in with you, you could reduce the overall cost and not have two extras laying around. I am pretty sure you will need the Gaia 1's for your Ht-3's.