Crown Audio GLM-100, GLM-200 specifications Specifications

GLM-100 GLM-200

POLAR

PATTERN

MINIATURE OMNIDIRECTIONAL

AND HYPERCARDIOID

MICROPHONES

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, flute 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 us- ing the included mounting hardware or tape. Used as a lavalier microphone, or hidden on a film set, the GLM disappears in use yet provides excellent sound quality.

The GLM-100is an omnidirectional mic with a low-impedance balanced XLR-type output, pow- ered by 12 to 48V phantom power.

The GLM-200is a hypercardioid mic with a low- impedance balanced XLR-type output, powered by 12 to 48V phantom power.

The omnidirectional GLM-100is the best choice if you need:

Specifications

Type: Miniature condenser.

Element: Electret condenser.

Frequency Response (typical):

GLM-100: 20 Hz to 20,000 Hz. See Fig. 1.

GLM-200: 60 Hz to 20,000 Hz. See Fig. 2.

Polar Pattern:

GLM-100: Omnidirectional. See Fig. 3.

GLM-200: Hypercardioid. See Fig. 4 on other side.

Impedance:

GLM-100: 240 ohms balanced. Recommended minimum load impedance 1000 ohms. GLM-200: 100 ohms, balanced. Recommended minimum load impedance 1000 ohms.

Open Circuit Sensitivity:

GLM-100: 3.2 mV/Pa*(–50 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*.

Optional Accessories: Crown PH-1A Battery Phantom Supply (battery or AC adapter powered, single channel, 475 hours battery life with GLM-100, 375 hours battery life with GLM-200).

*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.

Fig. 1.	GLM-100 Frequency Response
+15
+10
+5
dB 0
-5
-10
-15
-20
-25
-30
-35
20	100	1K	10K	20K

•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-200is the best choice if you need:

•Rejection of background noise, room acoustics, feedback, and sounds behind the microphone.

The GLM-100 may have adequate rejection of those unwanted sounds if it is used close to the sound source.

Made of a rugged, resilient space-age material, the GLM’s molded housing is designed to resist dam- age from demanding professional use.

Equivalent Noise Level: Fig. 2. GLM-200 Frequency Response

GLM-100: 28 dB SPL	+15
A-weighted, typical
	+10
(0 dB = .0002 dyne/cm2).	+5		0°
GLM-200: 31 dB SPL A-weighted, typical	dB 0
(0 dB = .0002 dyne/cm2).	-5		90°
S/N Ratio:	-10
	-15
GLM-100: 66 dB at 94 dB SPL.
	-20
GLM-200: 63 dB at 94 dB SPL.
	-25		120°
Maximum Sound Pressure Level:
	-30
GLM-100: 150 dB SPL produces 3% THD.	-35	100	1K	10K	20K
GLM-200: 131 dB SPL produces 3% THD.	20
			Frequency in Hz
Polarity:
Positive pressure on the diaphragm produces
positive voltage on pin 2 with respect to pin 3 of
output connector.

Performance benefits 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 cap- sule. 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.

Operating Voltage:

Phantom power, 12 to 48 volts DC, positive voltage on pins 2 and 3 with respect to pin 1 of output connector.

Operating Temperature Range: –18° to +57° C

(+0° to +135° F).

Current Drain:

GLM-100: 1.1 mA.

GLM-200: 1.4 mA.

Materials: Black PVC housing.

Cable:

8-foot, black, permanently attached cable with rug- ged strain/flex relief and 3-pin pro audio connector.

Weight: 1 ounce (27.5 grams) without connector, 2.8 ounces (78.5 grams) with connector.

Dimensions: See Fig. 5 on other side.

Fig. 3. GLM-100 Polar Response

330˚	0˚	30˚
	FRONT
300˚	-0 dB	60˚
	-5
	-10
	-15
	-20
270˚		90˚
240˚		120˚
		20 Hz - 3.5 kHz
		10 kHz
	REAR
210˚	180˚	150˚

Included Accessories:

GLM-UM Universal Mount, GLM-TB Tie Bar, GLM- BC Belt Clip, and a GLM-WS2 Windscreen.