Thanks Paul for inspiring me with your Paul’s Post on the importance of using subwoofers even with speakers of otherwise full range capability. I added a pair of servo subs to my full range ribbon speakers (ribbons rated down to 25 Hz) and the sound transformation is incredible. Recording venue ambiance, deep bass and even upper bass are all improved.
With the help of test equipment I was able to easily dial in optimal settings on the sub. They certainly flatten out the somewhat lumpy dipole bass. My main speakers run biamped, full range with the subs input coming from a parallel connection to the main’s woofer input. All reservation I had with the DS’s low bass performance are gone.