I had cornwalls for a long time. You really don't need any larger in the klipsch line. They will go as low as you could ever want. Quite efficient too. I would change the EL34s though. You can pick up a quad of Svetlana's for about $50 (upscaleaudio.com). They will improve the dynamics and upper frequency clarity a lot more than new cables. Also, what kind of 12ax7's are you using? You may want to change them also to get a softer, cleaner sound.
Emery
emfoods@yahoo.com

