low phono output, high c/d output-what gives?

I recently purchased a NAD integrated amp and a NAD pp2 phono pre amp. I have my Sota hooked up to it with a Ortofon 2M Bronze-moving magnet. I have the PP2 switched to mm. When listening to vinyl the volume knob is at the 10:30 position which seems approporiate. However, when I switch to a c/d, there is so much more gain its crazy-the volume knob needs to be at 8:30 position. Im worried about accidently switching from phono to c/d and damaging my speakers. Shouldnt the volume levels be about equal when switching b/t phono and c/d??? Is there a problem with my intergrated amp? Thanks.