Heil Sound RC37 Supercardioid Dynamic Wireless Mic Capsule

Heil Sound RC37: Studio-Grade Dynamic Sound, Wireless

The Heil Sound RC37 is a dynamic wireless microphone capsule that brings the sound of the wired PR37 to handheld wireless systems. A wireless capsule is the interchangeable head that threads onto a wireless transmitter body in place of its stock capsule, upgrading the microphone element without changing the radio hardware. For touring vocalists and houses of worship already invested in a wireless system, it is a direct path to a far better voice.

The PR37 Element, Untethered

Inside the RC37 is the same dynamic element, internal mount, and rear-rejection design as the wired PR37 microphone. A dynamic element generates its signal from a moving coil rather than a powered circuit, giving it a rugged, natural sound and immunity to the handling that a handheld mic endures. Vocalists gain the clarity, presence, and body of a studio-grade Heil mic while keeping the freedom of a wireless handheld.

Supercardioid Control for Loud Stages

The RC37 uses a supercardioid polar pattern, a tightly focused pickup that hears the voice directly in front while strongly rejecting sound arriving from behind, measured at -40 dB at 180 degrees off axis. That rear rejection is what lets a vocalist stand in front of a loud monitor or PA without triggering feedback. On a high-volume stage, the pattern keeps the vocal isolated and intelligible in a dense mix.

Clarity Even When Cupped

Singers instinctively cup a handheld microphone, and on most capsules that hand acts like a chamber that boxes in the tone and invites feedback. The RC37 is engineered so that cupping does not degrade its clarity or quality the way it does on an industry-standard capsule. This means a performer's natural technique no longer fights the microphone, delivering a consistent sound take after take.

Built to Take a Full Performance

With a maximum SPL of 140 dB, a balanced 370-ohm impedance, and a 40 Hz to 18 kHz frequency response, the RC37 is built to capture powerful vocals cleanly. The high SPL ceiling means even a belting singer working right on the grille will not overload the element into distortion. From soft verses to full-voice choruses, the capsule tracks the full dynamic range of a live performance.

A True Drop-In Upgrade

The RC37 uses a 1.25 in. (31.3 mm) capsule thread with a 28-per-inch pitch (1.0 mm) that mates with major wireless handheld systems that accept interchangeable capsule heads. Swapping the stock head for the RC37 upgrades an entire wireless microphone fleet in seconds, with no new bodies or receivers required. Sound companies, worship teams, and touring engineers use it to standardize on the Heil vocal sound across every wireless channel they run.