I think @HH2010 chose his words carefully. Bass information is not the same as bass performance or SPL. Keltiks are older speakers and having owned and loved a pair for many years prior to 350's I would say the weight of bass is unquestionable but the accuracy.....
I’ve red and understand the difference, but I figure that between 55hz and 20hz belies a lot of information, not to mention extra layers and foundation for the rest of the Hz.
YMMV