From the Manufacturer

The SKRM-100 Subkick is a low-frequency capture device that picks up the low frequencies (100Hz-2000Hz) that a normal microphone can’t. When used in conjunction with a normal internal microphone (for the attack), your kick drum has a jaw-dropping bottom end like you’ve never heard before. Positioning Produces a Wide Range of Tonal Variations. Varying placement and proximity of the Subkick affects the nature of the sound captured, opening the door to a wide range of tonal possibilities.Try it directly in front of the sound hole or from various distances in front of the head to “dial in” degrees of ambience, punch, and volume.The Subkick works equally well in the studio and lve. Specially Designed Stand Offers Versatile Placement. The three-legged stand and ball clamp offer excellent stability and durability while the ball clamp offers versatile placement and angle adjustment of the mic unit.