As to comments above about Autofomers.
The 600's always sounded WONDERFUL into dynamic drivers, modified or not.
When I first went to E-stats they did NOT sound that good. I almost got rid of them. I went to some VTL mono blocks (160) they were only marginally better. It wasn't entirely the amps. It was partially the entire system.
In an effort to get the VTL's to sound good I eventually went to autoformers. It did not do much for the VTL's but I eventually brought one of my Moscodes out of a year's retirement in the garage and tried it with the Autoformers. Holly ***t, there was the glory of the Moscodes that I remembered, as I upgraded the system, including speaker wire, the Moscodes eventually sounded better without the Autoformers and I moved them along.
So, given the speakers you are using, a good Moscode 600 will kick ***t and two in vertical biamp should blow you away.
Hope that helps.
Bruce