Decibels is a logarithmic scale. What you're describing is totally expected and Pinnacle would be broken doing anything else.

Each rise of 3db is about a doubling of sound. If we took a starting kennel of 90db, you would end up going from 30db to 90db. 

30 you would hardly hear. 60 is normal conversation. 90 is between a gas powered lawnmower and a motorcycle.