If you compare speakers that go down to 50hz to ones that go down to 30 or 20 hz, you will find that the first set of speakers miss a lot of crucial information. The speakers that go deeper even sound bigger on many records, even ones that would seem to have few deep notes. At the recent California Audio show, I found that very few speakers could play accurately several of my vinyl records. Of course, the "Adgio D'Albinoni", with Gary Karr on double bass and Harmon Lewis on organ was a test only a handfull could pass, and then with a low grade. However, almost all speakers failed to capture the power in such records as Muddy Waters's "folk singer", "Chet" (a small jazz group), and even such "easy" records like "John Contrane and Johnny Hartman". On the speakers that couldn't go deep, the sound was thinner and "washed out". There was a significant difference even on my "Waltz for Debby" Bill Evans record.

BTW, one of the rooms (I forget which one) was playing the "Waltz for Debby" record in higher and higher CD resolution versions. Yes, the sound kept getting better, but when I got them to play my vinyl version, there was still a huge gap between the highest digital and vinyl. Especially in tonal saturation and dynanmics.