I'm looking for a directional (off-axis rejection) microphone with flat frequency response. The Shure SM81 is the only such mic that I've been able to find online, however its frequency response chart has multiple lines and I don't know what that means?

From Shure SM81 spec sheet pdf

enter image description here

up vote 7 down vote accepted

The response curves are for each of the three selectable roll-off switch positions...

  • Flat enter image description here
  • –6 dB/octave below 100 Hz enter image description here
  • –18 dB/octave below 80 Hz enter image description here

From the spec sheet -

Low Frequency Response Switch Positions
Flat; –6 dB/octave below 100 Hz; –18 dB/octave below 80 Hz

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