Description
Product Overview
The Heil RC 37 is a premium dynamic wireless replacement capsule engineered to bring the next-generation performance of the Heil PR 37 handheld vocal microphone to wireless handheld transmitters. Designed specifically to cut through dense, high-volume live instrument mixes, the RC 37 delivers exceptional upper-midrange clarity, fast transient response, and pristine vocal articulation for lead vocalists and broadcast professionals.
Featuring a large dynamic element, the RC 37 provides a wide 40 Hz to 18 kHz frequency response and handles extreme sound pressure levels up to 140 dB Max SPL without distortion. Its tight supercardioid polar pattern yields an industry-leading -40 dB of rear noise rejection at 180° off-axis, providing maximum gain-before-feedback and isolating vocals from stage monitor bleed and drum spill. Built with industry-standard 31.3 mm / 1.0 thread pitch mountings, the RC 37 seamlessly replaces factory capsules on major wireless handheld transmitters (including compatible Shure, Lectrosonics, Line 6, Audio Technica, and Sony systems) for an immediate upgrade in live vocal presence and clarity. It is is compatible with some Sennheiser systems with the proper adapter (see ambient.de for adapters and compatible systems).
Key Features
- PR 37 Sound Quality for Wireless Systems: Translates the ultra-clear, transparent vocal voicing of the wired PR 37 dynamic microphone into a wireless capsule format.
- High Output Sensitivity (-48.9 dB): Engineered with higher output level capability to ensure clean preamp drive and strong signal-to-noise ratio across wireless transmitters.
- Exceptional Stage Isolation (-40 dB Rear Rejection): Supercardioid polar pattern provides outstanding rejection at 180° off-axis, preventing feedback and suppressing bleed from loud stage instruments.
- Universal Wireless Transmitter Compatibility: Threaded mount attaches directly to industry-standard handheld wireless transmitters with 31.3 mm diameter / 1.0 thread pitch mounts (including compatible Shure, Lectrosonics, Line 6, and Sony models).
- High SPL Capacity (140 dB Max SPL): Effortlessly handles high sound pressure levels without clipping or mechanical distortion, making it ideal for powerful vocalists.
- Internal Shock Mounting: Built-in dynamic element isolation minimizes handling noise and mechanical vibration transmitted through the wireless body.
- Heavy-Duty Metal Mesh Grille: Rugged outer screen protects the internal capsule structure from stage impacts, breath plosives, and sibilance.
Heil RC 35 vs. Heil RC 37 Comparison Matrix
| Feature / Specification | Heil RC 35 | Heil RC 37 |
|---|---|---|
| Base Wired Microphone Design | Heil PR 35 Dynamic Microphone | Heil PR 37 Dynamic Microphone |
| Vocal Tone & Profile | Warm, rich, full-bodied studio sound with natural low-end presence | Ultra-clear, modern transparent sound designed to cut through dense, loud mixes |
| Frequency Response | 40 Hz – 18 kHz | 40 Hz – 18 kHz |
| Polar Pattern | Supercardioid | Supercardioid |
| Rear Rejection (@ 180°) | -35 dB | -40 dB |
| Output Sensitivity Level (@ 1 kHz) | -52.9 dB | -48.9 dB (Higher output sensitivity) |
| Impedance | 370 ohms balanced | 370 ohms balanced |
| Maximum SPL Handling | 140 dB | 140 dB |
| Primary Stage Applications | Vocalists seeking condenser-like warmth, acoustic sets, and controlled stages | High-volume rock stages, dense instrumental mixes, and maximum off-axis rejection |
Product FAQs
Question: Which wireless transmitters are compatible with the Heil RC 37 capsule?
Answer: The Heil RC 37 features industry-standard 31.3 mm threading and concentric contact rings. It is directly compatible with handheld wireless transmitters from manufacturers such as Shure, Lectrosonics, Line 6, Audio Technica, and Sony that accept removable screw-on capsules. (Note: Sennheiser handheld transmitters require a third-party thread adapter.)
Question: Does the Heil RC 37 require phantom power or battery power from the transmitter?
Answer: No. The RC 37 utilizes a passive dynamic element structure and draws no battery power from the wireless transmitter. The transmitter simply sends the audio signal generated by the dynamic capsule over RF.
Question: What is the sound difference between the Heil RC 37 and the RC 35?
Answer: The RC 37 is Heil’s next-generation capsule, offering higher output sensitivity (-48.9 dB vs -52.9 dB), greater rear noise rejection (-40 dB vs -35 dB), and an upper-midrange voicing designed to cut through high-volume, dense stage mixes easily. The RC 35 offers a warmer, condenser-like tone with deeper low-end warmth.
Question: How does the RC 37 handle feedback on loud stages?
Answer: The RC 37 excels in high-volume environments thanks to its supercardioid polar pattern and -40 dB of rear rejection at 180° off-axis. It isolates the lead vocal while rejecting monitor bleed and guitar cabinet bleed, allowing high gain-before-feedback on stage.
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