T
he 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 us-
ing 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, pow-
ered by 12 to 48V phantom power.
The
GLM-200
is a hypercardioid mic with a low-
impedance balanced XLR-type output, powered by
12 to 48V phantom power.
The omnidirectional
GLM-100
is 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 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.
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 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.
MINIATURE OMNIDIRECTIONAL
AND HYPERCARDIOID
MICROPHONES
GLM-100
GLM-200
Specifi cations
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*.
Equivalent Noise Level:
GLM-100: 28 dB SPL
A-weighted, typical
(0 dB = .0002 dyne/cm
2
).
GLM-200: 31 dB SPL A-weighted, typical
(0 dB = .0002 dyne/cm
2
).
S/N Ratio:
GLM-100: 66 dB at 94 dB SPL.
GLM-200: 63 dB at 94 dB SPL.
Maximum Sound Pressure Level:
GLM-100: 150 dB SPL produces 3% THD.
GLM-200: 131 dB SPL produces 3% THD.
Polarity:
Positive pressure on the diaphragm produces
positive voltage on pin 2 with respect to pin 3 of
output connector.
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/fl ex 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.
Included Accessories:
GLM-UM Universal Mount, GLM-TB Tie Bar, GLM-
BC Belt Clip, and a GLM-WS2 Windscreen.
*1 pascal = 10 dynes/cm
2
= 10 microbars = 94 dB SPL
.
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).
Fig. 3.
GLM-100 Polar Response
20 Hz - 3.5 kHz
10 kHz
FRONT
REAR
-20
-15
-10
-5
-0 dB
60
˚
90
˚
120
˚
150
˚
180
˚
210
˚
240
˚
270
˚
300
˚
0
˚
30
˚
330
˚
POLAR
PATTERN
Fig. 1.
GLM-100 Frequency Response
20
100
1K
10K
+15
+10
+5
dB
0
-5
-10
-15
-20
-25
-30
-35
20K
20
100
1K
10K
+15
+10
+5
dB
0
-5
-10
-15
-20
-25
-30
-35
0
°
90
°
120
°
20K
Fig. 2.
GLM-200 Frequency Response
