I've tested my 990 with a SPL meter and I do not see or hear a change in volume when I switch between Bypass and Upsample. I am playing a test CD with pink noise and the volume level is the same no mater what. I'm using a SPL meter because I don't trust my ears and it reads the same no mater what. I tested this with both analog and digital inputs and all reads the same. Why don't I see/hear this when others clearly do? My main speakers are set to large and the sub is set for L/R+Sub.