I agree with the others here. Going to bass limited main speakers (down to about 40Hz) and adding two subs was a major improvement to the sound of my system. Two subs was a significant improvement over one and the only other major improvement I would consider at this time would be to add a third (or fourth) sub. Fortunately, my subs can be adjusted by remote volume control so I have their level and phase set up for 80+ percent of the recordings I listen to but have the ability to easily adjust volume if necessary for certain recordings or if I am playing my system at a lower or higher volume level than typical.
Different subwoofer settings for different albums?
So a dealer I know told me that he doesn’t use subwoofers and doesn’t know anyone who does (!) because he finds that every record has different levels of bass and would require a new subwoofer crossover point to properly blend with the main speakers. Anyone else have this experience?