What "classical" music do you recommend, if you want to test speakers for lower bass performance?
Right now I look to Sergei Rachmaninoff, All-Night Vigil (1915) [aka Vespers], particularly movement 5, "Now Lettest Thou."
The final measures has the lower bass vocalists descending to a low B-Flat.
It's fun to imagine where your ears start to lose it and your imagination substitutes in.
But other choices, if you want to show off your speakers and subwoofers?
All suggestions appreciated.