What are you guys driving your cabinets with amp and/or power wise? I recently acquired a pair of the "old design" cabinets which are rear ported and use the Kappa drivers. I'm powering mine with a GK 400RB-III, 240W RMS @ 4 ohm. Sounds alright at low volume, but dosen't have the "sound" (clarity & punch?) when I'm pushing the head . I've been experimenting with the amp setting such as eq, turning the boost off, gain and master combinations...etc, but I believe my amp head just doesn't have the headroom. It does sound good (great) at low to moderate volumes. What are you guys using? Just so you know These cabinets have been modified with Speak-on connectors and I'm using 12 gauge speaker cable; over kill but gets the job done.