What you're talking about can be settled usually with a crossover, which is a device that filters out frequencies particular to your speaker, whether it is a subwoofer, midrange, or tweeter. A range from 60-80hz, which is what your sub is probably receiving, produces deep, rich, and rumbling bass. Whereas a range of 100-120hz produces a rather midbass quick thump.
Check the back of the subwoofer or on the receiver for subwoofer settings. If it's non existent then you can always purchase a crossover for rather cheap, no more than the cost of a speaker.
Thank you Come Again