So at Will's place, was the 950 set to "stereo" or "bypass"? Were the mains set to "large" or "small"?

What about at Ricky's on his 950?

Based on what Scott said, setting the thing to "bypass" and "small", and you can get the double-bass, assuming you have full range mains. Set to large and no double-bass, only the mains are active. Set to small in "stereo" and the crossover avoids the double-bass as well. Not sure what would cause no bass in 2-channel, unless you were set to "stereo" & "small", turned off your sub, and had a high crossover.