Hi Stephane.

Like John, I ask forgiveness for belaboring the obvious. It's just that if we eliminate the simple stuff we stand a better chance to be of help. I'm not familiar with your processor, but when in the stereo 2 channel mode, without the subwoofer, are your mains set to large, rather than small, in the processor's speaker menu? If they are set to small and crossed at 80Hz in the processor, but you're not using the subwoofer, that would explain the lack of bass.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton