I had a REL Storm III and now have a JL Audio F113, so they are close to the B3 and F112. I use my sub to augment Wilson WP7's, so I only run them up to 30 Hz, mainly to pressurize the room. That being said, the F113 is much more powerful and has a much greater range of controls and adjustments, even including a microphone with a calibration cycle to add a notch filter to the largest room mode. If you ever want to hear 20 Hz bass that also feels like an earthquake, try this one. IMO the JL is a better sub for low bass impact and for the first time I can hear the pat of bass drum pedals and the pitch of the bass drum. Both subs are great at blending in and not calling attention to themselves--the only way you can tell it is on is to turn it off and then realize how much impact it was adding.