"The Stevie Wonder Mic" The Heil Sound PR 35 Handheld Microphone is intended for commercial broadcast, recording and sound reinforcement applications. The PR 35 was designed around the acclaimed PR 30 live sound microphone, which features a wide frequency response, excellent feedback rejection and sorbothane shock mount. Its large aluminum 1-1/2" low-mass voice coil assembly yields exceptional performance. Specially wound and placed humbucking coils reject RF noise from nearby monitors. The PR 35 also features a 3-position low-frequency roll-off switch with flat -3dB and -6dB settings.