Mic Archive

Crown

Crown GLM-100

Miniature electret condenser, omnidirectional ("Great Little Mic"), with permanently attached cable and XLR connector

Approximate Some readings for this mic are uncertain; see the graphs.

Type
Condenser (electret)
Pattern
Omni
Sensitivity
−50 dBV/Pa
Self-noise
28 dB(A)
Max SPL
150 dB SPL
Impedance
240 Ω
Rated range
20 – 20k Hz

Frequency response

Angle
Distance

Frequency response: from the spec sheet p1 md, p. 1. Fig. 1 "GLM-100 Frequency Response"; the specifications call the response "typical". Distance, room, 0 dB reference and smoothing not stated. Approximate reading error up to about 1 dB.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern

Polar pattern: from the spec sheet p1 md, p. 1. Fig. 3 "GLM-100 Polar Response"; legend "20 Hz - 3.5 kHz" (solid) and "10 kHz" (dashed). Rings 0 to -20 dB. Measuring conditions not stated. Approximate reading error up to about 1.5 dB.

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All specs

From the spec sheet p1 md
Sensitivity−50 dBV/Pa (3.2 mV/Pa), open circuit; also −52 dBV/Pa, catalogue (about 1986): "-72 dB re 1V/microbar". "Open Circuit Sensitivity: GLM-100: 3.2 mV/Pa* (-50 dB re 1 volt/Pa*)". -72 dB re 1 V/µbar is -52 dB re 1 V/Pa.p. 1
Self-noise28 dB(A), typical. "Equivalent Noise Level: GLM-100: 28 dB SPL A-weighted, typical".
Max SPL150 dB SPL, 3% THD. "150 dB SPL produces 3% THD".
Signal-to-noise ratio66 dB, at 94 dB SPL
Output impedance240 ohm, balanced. "240 ohms balanced. Recommended minimum load impedance 1000 ohms."
Rated load impedance1000 ohm, recommended minimum
Rated frequency range20 Hz to 20 kHz, typical. "Frequency Response (typical): GLM-100: 20 Hz to 20,000 Hz."
Poweringphantom, 12 - 48 V DC. "Phantom power, 12 to 48 volts DC, positive voltage on pins 2 and 3 with respect to pin 1".
Current draw1.1 mA
ConnectorXLR-3 (on an 8 ft permanently attached cable). "8-foot, black, permanently attached cable with rugged strain/flex relief and 3-pin pro audio connector."
Weight27.5 g, without connector; also 78.5, with connector. "1 ounce (27.5 grams) without connector, 2.8 ounces (78.5 grams) with connector".
FinishBlack PVC housing. "Materials: Black PVC housing."
Supplied accessoriesGLM-UM universal mount; GLM-TB tie bar; GLM-BC belt clip; GLM-WS2 windscreen
Power sensitivity-50 dB re 1 mW/Pa
PolarityPositive pressure on the diaphragm gives positive voltage on pin 2 with respect to pin 3
Operating temperature-18 to +57 °C (0 to 135 °F)
Optional accessoryCrown PH-1A battery phantom supply (battery or AC adapter; about 475 hours battery life with the GLM-100)
Uses (Crown)Lavalier, instruments (guitar, sax, flute, drum rims), concealed miking on film sets
From the catalog
VariantGLM-100/E: no cable connector, for direct connection to a wireless transmitterp. 8
Catalogue accessories (about 1986)Included: GLM-UM universal mount, GLM-WS2 and GLM-WS3 windscreens, GLM-TM tie-bar mount with belt clip, double-sided tape. Optional: GLM-TT tie tack, GLM-DM drum, GLM-CM cymbal, GLM-HM horn and GLM-SM surface mounts, PH-1 and PH-4 phantom supplies
From the spec sheet p2 md
Dimensions (Fig. 5)Width .310 in (7.9 mm) at the top; .505 in (12.8 mm) and .755 in (19.2 mm) along the head; .680 in (17.3 mm) taper; cable .185 in (4.7 mm) diameter maxp. 1

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Crown, unchanged, with its original address.

Recommended for

Instruments whose sources name this mic, or an earlier version or variant of it.

Other mics