Have you tried switching their positions? If you put the new one on the center channel, that may be why it's getting the most bass. Kick drums are usually mixed in the middle.

Try swapping the speakers around and see if the bass output follows the channel assignment or the speaker.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs