Heil Pr28 Cardioid Drum Microphone Radial Engineering and rear rails are options

and rear rails are options available for all 90 and 70 Spire rack enclosures

so the resonant frequency of a good microphone design should be as low as possible

Focusrite Octopre Mk2 8 Channel Microphone Preamp

Interior Length: 51

Heil Pr28 Cardioid Drum Microphone Radial Engineering and rear rails are optionsThe PR 28 is Heil's premier drum microphone. Its tight cardioid pattern, wide frequency response, and stellar rear rejection make it ideal for toms, snares, bongos, and many other applications. The Heil drum microphone's unique dual suspension system between the actual dynamic element and the grille and body reduce unwanted vibrations. Dual suspension system between dynamic element and the grillePattern: CardioidFrequency response: 55Hz 18kHz (3dB