PS Audio Trio C-100 low input normal?

just picked up a PS Audio Trio C-100 and it sounds great, the only question i have is that when playing thru my speakers the input volume needs to be almost past half-12 noon (turned up +50%) before you can hear anything. is the normal or is something wrong? inputs used were a sony es cd player, music hall phono player with a cambridge audio phono stage. both require the amp to be turn pass half way, but once past half it get loud quickly.

thanks