You are describing how low frequencies can be perceived from a subwoofer as you move about the room, or even just a few feet. The 80's can play pretty low, and often people will ask during auditions if I have my subwoofer(s) even turned on, when often I will turn them off as a comparison.
If you don't have a subwoofer, it would be a good idea as it will move more air with the larger driver, and the proper crossover will blend with the 80's and fill those voids. If you do have a subwoofer, how do you have things configured. For me multiple subs positioned correctly makes it hard to find any position with out intense bass.
