I just got an svs pci 20-39 a few days ago and am very disappointed with its performance. My set up is a 14'x14' room with slate floors and 9' ceilings I am running def techs up front (Each with 10 inch 250watt powered subs)A denon 3802 receiver. My problem with the sub is it just does not produce the bone crushing bass i have heard described on this board. In fact I think my set up is worse for having it. It is ok at very very low bass but for all around it is a real disappointment. I have tried various locations in the room with only limited improvement. I have turned up the output to it from the receiver, cranked the gain on the sub, run my fronts in small mode, and checked several times to see if it was hooked up ok...nothing!! I am thinking of hauling it into ultimate and listening to it next to the sunfire sub! as a last ditch before sending it back! not happy! help!!