mmmmmm, Ti 15's. I've heard of people giving them up to 1000 watts each. The RMS for the 15's is 550 watts, so you'll want to give them at least that, allthough they do get pretty loud with low power. Also...i am somewhat biased too. But if you're going fo 50/50, I think the Ti's would be a better choice, and 2 15's will be very loud.