Meyer Sound Self-Powered Studio Monitor HM-1S - Manual (Page 13)

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This represents a typical ground-plane response of the HM-1S, on-axis at 1 meter. Keep in mind that any surface
close to the test space can create reflections which will change the response of the speaker.
Connect the subwoofer to the HM-1S and measure the combined response of the system.
HM-1S on axis at 1 meter, ground plane.