technical info about the glm-100
The Crown® GLM or “Great Little Mic” is a miniature electret condenser microphone designed for professional recording and sound reinforcement. It offers the quality of large studio microphones, yet is nearly invisible in use. The GLM can be attached to an acoustic guitar, sax, fl ute or the performer's face to allow freedom of movement. It can be attached to drum rims to pick up a drum set without the unsightly clutter of boom stands. These attachments can be made using the included mounting hardware or tape. Used as a lavalier microphone, or hidden on a fi lm set, the GLM disappears in use yet provides excellent sound quality. The GLM-100 is an omnidirectional mic with a low-impedance balanced XLR-type output, powered by 12 to 48V phantom power. The GLM-100E is an omnidirectional mic for wireless use. It has a medium impedance unbalanced, unterminated output and is powered by 1.1 to 20 VDC, unipolar or bipolar. The GLM-200 is a hypercardioid mic with a lowimpedance balanced XLR-type output, powered by 12 to 48V phantom power. The omnidirectional GLM-100 or GLM-100E are the best choice if you need: • Less wind noise • Less pickup of mechanical vibration • Deep low-frequency response down to 20 Hz • 150 dB maximum SPL • Smoother frequency response The hypercardioid GLM-200 is the best choice if you need: • Rejection of background noise, room acoustics, feedback, and sounds behind the microphone. The GLM-100 or GLM-100E may have adequate rejection of those unwanted sounds if they are used close to the sound source. Made of a rugged, resilient space-age material, the GLM’s molded housing is designed to resist damage from demanding professional use. Performance benefi ts of the GLM include: a wide, smooth frequency response; excellent transient response; and minimal off-axis coloration. The GLM’s housing is designed to improve the high-frequency response of the microphone capsule. In contrast, the frequency response of large microphone capsules often is degraded by the microphone housing (due to sound diffraction). Included with the GLM-100 and GLM-200 are a GLM-UM Universal Mount, a GLM-TB Tie Bar, GLM-BC Belt Clip, and a GLM-WS2 Windscreen. Included with the GLM-100E are a GLM-TB Tie Bar and GLM-WS2 Windscreen.
Specifications
Type: Miniature condenser.
Element: Electret condenser.
Frequency Response (typical): GLM-100 and GLM-100E: 20 Hz to 20,000 Hz.
Polar Pattern: GLM-100 and GLM-100E: Omnidirectional
Impedance: GLM-100: 240 ohms balanced. Recommended minimum load impedance 1000 ohms. GLM-100E: 3500 ohms unbalanced with unipolar powering, 1140 ohms unbalanced with bipolar powering. Recommended minimum load impedance 8000 ohms.
Open Circuit Sensitivity: GLM-100: 3.2 mV/Pa*(–50 dB re 1 volt/Pa*) GLM-100E: 8 mV/Pa* (–42 dB re 1 volt/Pa*) GLM-200: 6 mV/Pa* (–44.5 dB re 1 volt/Pa*).
Power Sensitivity: GLM-100: –50 dB re 1 mW/Pa*. GLM-200: –40.5 dBm/Pa*.
Equivalent Noise Level: GLM-100 and GLM-100E: 28 dB SPL A-weighted, typical (0 dB = .0002 dyne/cm2).
S/N Ratio: GLM-100 and GLM-100E: 66 dB at 94 dB SPL.
Maximum Sound Pressure Level: GLM-100: 150 dB SPL produces 3% THD. GLM-100E: 148 dB SPL produces 3% THD with bipolar power; 120 dB SPL produces 3% THD with unipolar power.
Polarity: GLM-100 : Positive pressure on the diaphragm produces positive voltage on pin 2 with respect to pin 3 of output connector. GLM-100E: Positive pressure on the diaphragm produces positive voltage on white lead with respect to shield.
Operating Voltage: GLM-100 : Phantom power, 12 to 48 volts DC, positive voltage on pins 2 and 3 with respect to pin 1 of output connector. GLM-100E: Unipolar powering is +1.1 to 20 VDC on red lead relative to shield. White lead is audio. Bipolar powering is + voltage on red lead and – voltage on white lead relative to shield.
Current Drain: GLM-100: 1.1 mA. GLM-100E: 25 microamperes (unipolar power); 0.5 milliamperes (bipolar power). GLM-200: 1.4 mA.
Materials: Black PVC housing.
Cable: GLM-100 : 8-foot, black, permanently attached cable with rugged strain/fl ex relief and 3-pin pro audio connector. GLM-100E: 4-foot, black, two-conductor shielded cable with no connector. White: audio, red: B+, shield: ground.
Weight: 1 ounce (27.5 grams) without connector, 2.8 ounces (78.5 grams) with connector.
Dimensions: See Fig. 5 on other side.
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