First, my current set-up: For my front left and rights and my surrounds I'm using Def Tech BP6B's (20-175 watts), I'm not sure of the model of my Def Tech center (I think it was discontinued) but it's 200 watts, and my sub is the Definitive ProSub 80 (250watts). For the settings on my receiver for the sub... I thought my speakers were of decent size and the sub was rather small, so I currently have all my speakers set to large and the crossover on the sub set at 95 (it goes between 40-150). I had been getting incredible distortion when using the sub, so today I turned the low cut filter on and that seemed to cut some of the distortion out, although I had to turn the sub's volume up quite a bit. My problem is trying to find the right combination of settings to get a good amount of bass without some of the distortion I've been getting when it really needs to kick in. So, my questions: What do you think about my BP6B's being set to large and the sub's crossover being at 95??? What exactly is the low cut filter doing and should I keep it on if I'm hearing distortion? I know it sounds as if I just answered my own question but I want to make sure that won't hurt the performance of the sub. And what is the LFE attenuator??? I currently have it set at 0db (you can choose between 0db, 10db, and **db). Thanks in advance for all your help!!!