guys.... my manual says on p.31 (and i'm sure you all know this):
BYPASS SETTING:
"when playing an analog input source you may bypass the model 950's digital processing system and listen to the source in "pure" two-channel stereo."

this is exactly what my 950 does...no double bass. mains set to large, analog source, bypass mode= "pure two-channel stereo".

did i misunderstand this double bass thing altogether? help me out here.