Didn't get a chance to get it out of the box, but I did replace the PB10 with the 20-39PC+ in the bedroom. I plugged one port and set the SSF to 16 hz. and played some of my demo material, and all I can say is WOW, this thing literally shakes the floor of the entire upstairs. My girlfriend was lying in her bed in the other room and said she felt the floor shaking. My bedroom is around 1450 sq. ft., probably a bit less, so it's not a large room by any means, but it sure does sound amazing. It's pretty funny having a subwoofer that is taller than the front speakers.