I rehabed a pair of 4320s (see avatar) using the original drivers which included 2215s. I used the 3106 on the slots but bi-amped the woofer and horn at 1.2K. I bought a JBL Urei 6260 and 6230 power amp, as well as a 5235 crossover off of eBay.
With not that much money I was able to get these 4320s to sound better then they should. It requires patience and a bit of work.
Tom