Jcm,

As Gonk suggested, you could look into the current Outlaw Audio subwoofer deals. I used to own a Velodyne HGS-10 in a room about your size and even it would bottom out when I used Klipsch Heresy II mains and Klipsch KG2 rears. Once I replaced it with a Velodyne HGS-12, I didn't have the subwoofer bottom out anymore. I suspect with the highly efficient LaScalas and using "only" an 8" subwoofer driver found in the CT-80, you probably need to look into subs with at least a 12" driver and at least 300+ RMS watts to keep up with your 7125 and LaScalas. It's about driver size and wattage to move the air. The CT-80 with 135 watts RMS and the 8" driver is not enough for the room size you describe. Another alternative you may want to look at is the current Velodyne SPL-1500R offered at Audio Advisor for $999 shipped. It includes a 15" driver, 1000 watts RMS and built-in microphone to calibrate the sub to your room. Also, going with the Outlaw sub or larger Velodyne will enable you system to go deeper. That CT-80 only goes down to 35 Hz while the Outlaw or Velodyne can easily go down to 20 Hz and below.