Aside from the cabinet and power amp, can you describe any other characteristics you are concerned with? I'm at least familiar with the Karlsons, and from the web site there are several drivers recommended. By digging up the T/S specs for those, you can search for current drivers that are close. You can also model the drivers listed, find a standard tuned box they'd use, then search for a current driver that has similar characteristics. Wayne uses several differet Eminence models as well as the professional JBL's. Try those compared to the listed drivers. Chris