The Shure 512 headset microphone consists of the popular SM10A microphone element mounted on a lightweight headband with a single earphone. The Model 512 mic combines an efficient "open-air" headphone with a close-talking dynamic microphone. The unit is unobtrusive, durable, comfortable, and provides a wide frequency range.
The 512 microphone was designed for sports and news announcing, intercommunications systems, and special events remote broadcasting. It offers convenient handsfree operation, and a lightweight frame to reduce user fatigue. The mic's unidirectional pickup pattern reduces unwanted background noise, permitting its use in noisy environments. The microphone characteristics are tightly controlled resulting in consistent response and output, and the headphone response is tailored to enhance voice intelligibility.
The headband easily adjusts to fit a variety of head sizes and hairstyles, and the microphone boom can be adjusted to accurately place the microphone cartridge at the corner of the user's mouth. This hands-free Shure microphone is supplied with a foam windscreen to reduce explosive "popping" sounds, and a cable clip to secure the cable to clothing.
Shure 512 Features:
Close-talking dynamic microphone with a single earpiece and attached 7 ft. cable
Ideal for voice recognition or communication in production environments
Frequency response of 50 to 15,000 Hz
Shure 512 Specifications:
Type: Dynamic, close-talking
Frequency Response (at 8 mm 5/16 in.): 50 to 15,000 Hz
Polar Pattern: Cardioid (unidirectional) response _ uniform with frequency, symmetrical about axis
Impedance: Microphone rating impedance is 150 Ohms (200 Ohms actual) for connection to microphone inputs rated at 19 to 300 Ohms.
Output Level (closed-talked at 1,000 Hz): Open-circuit voltage: -47.0 dB (4.5 mV)
(0 dB=1 volt per 100 microbars); Power Level: -66.0 dB (0 dB=1 milliwatt per 10 microbars)
Hum Sensitivity (typical): 38.4 dB equivalent SPL in 1 millioersted field
Polarity: Positive pressure on diaphragm produces positive voltage on red lead and pin 2 of connector
Type: Dynamic, open-air, left side only
Frequency Response: 100 to 10,000 Hz, tailored for voice intelligibility (see Figure 3).
Impedance: 300 Ohms at 1,000 Hz
Polarity: Positive voltage on cable conductor produces positive pressure.
Output Level (at 1,000 Hz): 94 dB SPL at ear with 1 mW input
Cable: 2.1 m (7 ft.) attached cables: one 2-conductor shielded with black 3-pin XLR connector (microphone) and one single-conductor shielded with 2-circuit phone plug (headphones)
Net Weight: 6.5 oz (186 grams) including connectors