POLAR
PATTERN
MINIATURE OMNIDIRECTIONAL
AND HYPERCARDIOID
MICROPHONES
GLM-100
GLM-200
he Crown® GLM or “Great Little Mic” is a
miniature electret condenser microphone
designed for professional recording and
Specifications
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).
Type: Miniature condenser.
Element: Electret condenser.
T
sound reinforcement. It offers the quality of large
studio microphones, yet is nearly invisible in use.
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.
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
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.
Polar Pattern:
GLM-100: Omnidirectional. See Fig. 3.
GLM-200: Hypercardioid. See Fig. 4 on other side.
Fig. 1.
GLM-100 Frequency Response
+15
+10
+5
Impedance:
GLM-100: 240 ohms balanced. Recommended
minimum load impedance 1000 ohms.
GLM-200: 100 ohms, balanced. Recommended
minimum load impedance 1000 ohms.
dB 0
-5
-10
-15
-20
-25
-30
-35
The GLM-100 is an omnidirectional mic with a
low-impedance balanced XLR-type output, pow-
ered by 12 to 48V phantom power.
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*).
The GLM-200 is a hypercardioid mic with a low-
impedance balanced XLR-type output, powered by
12 to 48V phantom power.
20
100
1K
10K 20K
Power Sensitivity:
GLM-100: –50 dB re 1 mW/Pa*.
GLM-200: –40.5 dBm/Pa*.
The omnidirectional GLM-100 is the best choice if
you need:
• Less wind noise
Equivalent Noise Level:
GLM-100: 28 dB SPL
A-weighted, typical
Fig. 2.
GLM-200 Frequency Response
• Less pickup of mechanical vibration
• Deep low-frequency response down to 20 Hz
• 150 dB maximum SPL
+15
+10
+5
(0 dB = .0002 dyne/cm2).
GLM-200: 31 dB SPL A-weighted, typical
(0 dB = .0002 dyne/cm2).
0
• Smoother frequency response
°
°
dB
0
-5
90
The hypercardioid GLM-200 is the best choice if
you need:
• Rejection of background noise, room acoustics,
feedback, and sounds behind the microphone.
-10
-15
-20
-25
-30
-35
S/N Ratio:
GLM-100: 66 dB at 94 dB SPL.
GLM-200: 63 dB at 94 dB SPL.
120
°
Maximum Sound Pressure Level:
GLM-100: 150 dB SPL produces 3% THD.
GLM-200: 131 dB SPL produces 3% THD.
The GLM-100 may have adequate rejection of
those unwanted sounds if it is used close to the
sound source.
20
100
1K
10K 20K
Frequency in Hz
Polarity:
Made of a rugged, resilient space-age material, the
GLM’s molded housing is designed to resist dam-
age from demanding professional use.
Positive pressure on the diaphragm produces
positive voltage on pin 2 with respect to pin 3 of
output connector.
Fig. 3.
GLM-100 Polar Response
Performance benefits of the GLM include: a wide,
smooth frequency response; excellent transient
response; and minimal off-axis coloration.
Operating Voltage:
330
0
30
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).
˚
˚
˚
FRONT
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).
-0 dB
300
˚
60
90
˚
-5
-10
Current Drain:
GLM-100: 1.1 mA.
GLM-200: 1.4 mA.
-15
-20
270
˚
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.
˚
Materials: Black PVC housing.
Cable:
8-foot, black, permanently attached cable with rug-
ged strain/flex relief and 3-pin pro audio connector.
120
˚
240
˚
20 Hz - 3.5 kHz
10 kHz
Weight: 1 ounce (27.5 grams) without connector, 2.8
ounces (78.5 grams) with connector.
REAR
Dimensions: See Fig. 5 on other side.
210
180
150
˚
˚
˚
Included Accessories:
GLM-UM Universal Mount, GLM-TB Tie Bar, GLM-
BC Belt Clip, and a GLM-WS2 Windscreen.
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