Line Input max input level is +10 dBu and is correctly stated on the ProjectMix web page at
http://www.m-audio.com/products/en_u...xIO-focus.html This gives 6 dB headroom above the +4 dBu nominal level. +10 dBu = +7.8 dBV. So for consumer unbalanced inputs this gives almost 18 dB headroom above -10 dBV.