Thanks for the compliment. You can try any drivers that are suitable for that type of enclosure. Ideally you would want a high efficiency driver with a very light cone, like a Fostex or Lowther. I did the bolt-on driver baffle so I can try different ones later by substituting a different baffle with the right size cutout. They have been playing for about six hours now and the midrange is sounding much better. Just a breakin thing.