Heil Sound's PR 22 microphone.Fairview Heights, IL (July 16, 2008)--Expanding upon the company's PR 20, Heil Sound's PR 22 represents new dynamic microphone technology according to the company. The mic made its debut with Shelby Lynne on The Tonight Show with Jay Leno, and was recently featured on Gnarls Barkley's performance on Saturday Night Live.
The mic reportedly provides wide frequency range, low handling noise and the ability to handle +140 dB SPL for a range of professional applications. The PR 22 microphone is usable in high sound-pressure levels and said to be immune to overload conditions targeting it for live vocal and instrument applications as well as a microphone for recording studios.
The wide frequency response (50 Hz to 18 kHz) of the PR 22 posed challenges for Heil Sound engineers; conventional remedies to handling noise is to limit the usable bandwidth thus hindering frequency response, which was not acceptable. Bob Heil comments, "My goal was to develop an internal suspension system that would eliminate the low-frequency handling noise, but not sacrifice sound quality. Working with a 'suspension' engineer who deals in ceiling fans and motor mounts, we came up with the IsoBand, a unique internal band of specialized rubber which brings an exciting new dimension to the dynamic vocal microphone."
Heil’s understanding of phase coherence was applied to the PR 22 to create a linear cardioid pattern with up to -40 dB of rear rejection. Performance is achieved by using the combination of materials for the large 1 1/8-foot diameter low-mass diaphragm and a special mixture of neodymium, iron and boron. The PR 22 is supplied with a leatherette carrying case, a mic clip and three metal screw-on grille screens (black, silver and gold).