If you are looking for a variable microphone, you shall reduce distortion form high sound pressure levels and eliminate unnecessary low_end frequencies.

The GT7000 tube condenser microphone is a perfect choice for you. The GT7000 features nine different polar patterns remotely selectable on its custom power supply for ultimate versatility in use and ease of operation: omni-directional, cardioid, figure-8, and six intermediate stages. Its tube preamplifier circuitry uses the replaceable classic 12AX7 vacuum tube. Afull-bodies sound and a warm tone that is characteristic of vintage microphone. Furthermore, two slide switches are located below the head grille: low frequency attenuation switch and sensitivity attenuation switch. The GT7000 is a advisable choice for any professional studio, concert halls and stage amplifying.

Polar Pattern(s): omni-directional, cardioid, figure-8, and 6 intermediate stages,all selectable on AC powering unit.
Frequency Response: 20Hz〜20KHz
Sensitivity: (@ 1000Hz. 94dB S.RL)…16mV/Pa
Rated Impedance: 200 ohms
Equivalent Noise Level: 18dB (A weight IEC 651)
Max S.P.L for 0.5% THO @ 1000Hz: 144dB Power 
Requirement: Special