Does that mean that Earthworks M550's are no good on the bottom end?
Freq resp 9 Hz - 40kHz +1

This could be true, but I find it very hard to believe that the mic can
pick up 9hz or even 20hz, only 1 db down from 100hz. It might look
good on the spec sheet, but when using your ears, I believe you will
discover a different story.
Kevin