HT, Lack of volume out

[fobmbc]

I'm hooking up my HT..My pieces are as follows; Acurus A125x5 amp, B&K Ref 30, 2 sets of PSB Stratus Silvers and PSB Sub 2i subwoofer.. I've read or tried to read my B&K manual..this was a slightly used Ref 30. I don't seem to be getting maximum volume out. My display screen starts dbs say at -95dbs and goes up to +15 dbs.. I don't really seem to start hearing sounds till I get it up to around -24dbs and then it doesnt seem by +15 dbs to be able to reach max. volume. As I mentioned it was used and I seem to be confused with the Ref30 options and possible "preset" previous owners settings.. Should the display for volume max. out at only +15dbs ?? and should I not be able to hear till almost 3/4 of the way up from the start of -95dbs??

Help, fobmbc