Shure BETA27 Instrument Microphone

Instrument microphone stands out as the only side-address, supercardioid condenser microphone designed for professional sound reinforcement. It features a switchable low-frequency filter and a 3-layer internal pop filter to reduce background noise.

The BETA®27 side-address condenser microphone is precision engineered for professional sound reinforcement and project studio recording applications. Its flat frequency response and low self-noise provide unerring performance in demanding environments. A tight supercardioid pattern ensures high gain-before-feedback and maximum isolation from other sound sources.

Features

• Supercardioid polar pattern specifically targets the sound source consistently with greatly minimized bleed from off-axis sound sources
• Tailored for superior transient response from a low-mass, 1” externally-biased, ultra-thin 24 Karat gold-layered Mylar® diaphragm
• Flat, neutral frequency response for natural reproduction on stage or in the studio
• 3-position switchable low-frequency filter helps reduce unwanted background noise or counteract proximity effect for consistent, extended lowend
• -15 dB switchable attenuator handles extremely high SPLs with ease
• Premium electronic components and gold-plated internal and external connectors
• Internal pop filter with three separate mesh layers reduces wind and breath noise.

In the box:
- 1 A32M ShureLock™ Black Swivel Adapter
- 1 A27ZB Padded, Zippered Carrying Bag

Specifications

- Type: Condenser (externally biased)
- Frequency Response: 20 to 20,000 Hz
- Polar Pattern: Supercardioid
- Impedance: 160 Ohm

Sensitivity (at 1 kHz, open circuit voltage):
- -37 dBV/Pa
- 1 Pascal=94 dB SPL

Maximum SPL (1 kHz at 1% THD):
- 1000 Ohm load: 134 dB (148 dB, Pad on)
- 2500 Ohm load: 140 dB (154 dB, Pad on)

Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz):
- 85.5 dB
- S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted

Dynamic Range (at 1 kHz):
- 1000 Ohm load: 125.5 dB
- 2500 Ohm load: 131.5 dB

- Common Mode Rejection (20 Hz to 20 kHz): > 50 dB

Clipping Level (20Hz-20 kHz at 1% THD):
- 1000 Ohm load: 2.0 dBV
- 2500 Ohm load: 8.5 dBV
- THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL

- Self-Noise (typical, equivalent SPL, A-weighted): 8.5 dB
- Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
- Weight: Net: 428 g (15.1 oz.)

Switch:
- Attenuator: -15 dB
- Low Frequency Response: flat; -6 dB/octave below 115 Hz; -18 dB/octave below 80 Hz

- Connector: Three-pin professional audio (XLR), male
- Power Requirements: 48v DC phantom, 5.6 mA