If it has a reflex port at the back then it's not a bookshelf speaker.
At least that's not as bad as the Bose bookshelf speakers with a
tweeter at the rear.

Dr Klipsch and Dr Bose walking on opposite sides of the street.

Dr Klipsch cups his hands around his mouth and shouts "Hello Dr Bose, How
are you?"

Dr Bose turns away from Dr Klipsch and shouts "Fine thankyou, how are you"