i just hooked up my cs-ultra and i an not getting the bass i expected. i still have my 20-39cs with the new driver right next to it and the cs is outperforming the ultra. i am pretty sure the reason is because it am powering both with the same amp a marantz ma500, which does 180w @ 4 ohms. is this just too little power for the ultra. this is not the amp i am going to use perminately, i am probably going to get a samson s1000 or something, but i still expected it to outpeform my regular cs. it does sound good. i can tell it is cleaner then my cs but the cs is just noticeably louder. i guess what i want to know is should the cs beat a ultra with 180w because the ultra is less efficient? what do you guys have powering your csu? if i go out and get a samson s1000 for the csu i should get a significant increase in performance right? thanks for your help.