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Audio Technica PRO42
The Audio-Technica PRO 42 is an ultra-compact, low-profile boundary condenser microphone designed for surface-mount reinforcement in boardrooms, conference tables, council chambers, theatrical stage floors, and school meeting desks. Utilizing the acoustic boundary effect—placing a low-mass condenser element directly against a hard reflective boundary—the PRO 42 eliminates phase cancellation caused by surface sound reflections (comb filtering). It features self-contained electronics and a permanently attached 7.6-meter (25-foot) miniature cable terminating in a standard 3-pin XLRM connector, eliminating the clutter of external power modules.
Core Performance Features
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Boundary Effect Acoustic Principle: Places the condenser element millimeters away from the table or floor boundary, preventing direct and reflected sound waves from canceling each other out and delivering clean, intelligible speech.
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Half-Cardioid (Hemispherical) Polar Pattern: Provides a wide $120^\circ$ acceptance angle above the mounting surface while rejecting sound coming from underneath and behind the boundary plane.
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Low-Profile Miniature Footprint: Sits less than an inch high (21 mm) on table surfaces, remaining visually unobtrusive on video conference feeds, camera broadcasts, and stage floors.
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Self-Contained Internal Electronics: Houses its internal impedance converter directly in the housing/XLR connector, requiring no external battery packs or bulky inline modules.
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Integrated 25-Foot Cable: Outfitted with a durable, attached 7.6 m (25') miniature cable terminated with a standard 3-pin XLRM connector for direct patching into stage snakes or wall plates.
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Non-Slip Acoustic Isolation Pad: Fitted with a rubberized base pad that prevents surface slipping while attenuating table thumps, paper rustling, and mechanical vibrations.
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Wide Phantom Power Range: Operates on any standard phantom power source from 9V to 52V DC.
Technical Layout & Specifications
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Element Type: Fixed-charge back plate, permanently polarized condenser.
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Polar Pattern: Half-cardioid (cardioid in the hemisphere above the mounting plane).
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Frequency Response: 70 Hz – 14,000 Hz.
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Open Circuit Sensitivity: -38 dB (12.5 mV) re 1V at 1 Pa.
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Impedance: 100 Ohms.
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Maximum Input SPL: 134 dB SPL (1 kHz at 1% T.H.D.).
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Dynamic Range: 105 dB (1 kHz at Max SPL).
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Signal-to-Noise Ratio (SNR): 65 dB (1 kHz at 1 Pa, A-weighted).
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Phantom Power Requirements: 9V – 52V DC, 2 mA typical.
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Cable: Permanently attached 7.6 m (25.0') long, 3.2 mm (0.13") diameter miniature cable with 3-pin XLRM-type connector.
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Dimensions: 36.6 mm (1.44") maximum width x 54.3 mm (2.14") maximum length x 21.0 mm (0.83") height.
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Weight (Microphone Body): 35 g (1.2 oz).
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Finish: Low-reflectance black.
