Crown LM-200A Manual

LM-200A
T
he Crown ® LM-200A is a profes
sional-quality, supercardioid electret
con-denser microphone designed for
use on lecterns, pulpits, or similar applica-
tions.
The microphone is easily installed with
wood screws or bolts. As it is swiveled to
the desired position, adjustment is noise-
free, unlike with some conventional goose-
neck microphones. Swivel motion is limited
to prevent cable damage. The LM-200A is
rugged, and is built to withstand daily abuse.
Because of its supercardioid pickup pattern,
the LM-200-A rejects background noise and
room reverberation, and improves gain-
before-feedback, more than a microphone
with a cardioid pattern.
The LM-200A has a smooth, wide-range
frequency response for natural reproduction
of the voice. Low frequencies are filtered out
to reduce pickup of lectern thumps, room
rumble, etc.
The included wire-screen grille has a two-
stage pop filter to reduce pickup of explo-
sive breath sounds. An external foam
windscreen is supplied for extra pop rejec-
tion or for outdoor use. The base features
built-in shock mounts that attenuate han-
dling noise and lectern thumps.
The microphone output is balanced, low
impedance, which allows long cable runs
without hum pickup or high-frequency loss.
Two finishes are available: black (model LM-
200AP) or brown (model LM-200AB).
Operating Instructions
The LM-200A comes in two parts: a micro-
phone/swivel mount and an electronics
module.
Mounting:
1. Using the swivel mount as a template,
mark and drill three 1/8"-diameter holes for
the mounting screws (supplied).
Your pulpit might already have mounting
holes that fit the LM-200A. If these holes are
oriented opposite to those in the
200A base simply remove the Philips pan-
head screw from the side of the base and
align the holes in the base with those in the
pulpit. Then, rotate the boom arm 180°,
reinsert the pan-head screw into the hole in
the side of the base and mount the base to
the pulpit.
2. Drill a 1/2-inch diameter hole in the lec-
SUPERCARDIOID CONDENSER
LECTERN MICROPHONE
Specifications
Type: Unidirectional condenser.
Element: Electret condenser.
Frequency response (typical): 80 Hz to 15,000 Hz. See
Fig. 1.
Polar pattern: Supercardioid. See Fig. 2.
Impedance: 150 ohms, balanced. Recommended
minimum load impedance 1000 ohms.
Open-circuit sensitivity: 6.0 mV/Pa* (-44.5 dBV/Pa).
Power sensitivity: -42 dB re 1 mW/Pa*.
Equivalent noise level: 28 dB SPL typical (0 dB=.0002
dyne/cm 2 ), A-weighted.
S/N ratio: 66 dB at 94 dB SPL.
Maximum SPL: 120 dB SPL for 3% THD.
Polarity: Positive pressure on the diaphragm produces a
positive voltage on output terminal 2 with respect to
output terminal 3 on the electronics module.
Operating voltage:
Option 1: Phantom power, 9 to 48 volts DC, positive
voltage on output terminals 2 and 3 with respect to
output terminal 1 on the electronics module. Option 2:
9-24 volts DC, supplied by a separate AC/DC adapter
such as Crown PS-24. You select this powering
option by moving jumpers inside the electronics
module (see Operating Instructions).
Current drain: 1.4 mA.
Materials: Polycarbonate swivel mount and ball, steel
tube and grille, steel electronics module.
Finish: Black (LM-200AP) or brown (LM-200AB).
Cable: Grey, permanently attached, 2-conductor shielded
cable, terminated with spade lugs for connection to
electronics module. Six-and-one-half feet long from
swivel mount to spade lugs.
Weight (microphone and cable only): 10.2 ounces
(288.3 grams).
Weight (microphone, cable, and electronics module):
18.2 ounces (515 grams).
LM-
Dimensions: See Figs. 3a, 3b and 3c. All dimensions in
inches.
Included accessories: Foam windscreen, Crown part no.
WS-8.
Optional accessories: PH-1A phantom power supply
(1 ch., battery or AC adaptor powered), PH-4B
phantom power supply (4 ch., AC powered).
Fig. 1
Frequency Response
+15
+10
+5
0 ,6"
dB 0
–5
–10
–15
–20
–25
125,2'
–30
–35
20 100 1K
Frequency in Hz
Fig. 2
Horizontal-Plane Polar Response
0˚
330˚
FRONT
-0
300˚
-5
-10
-15
-20
270˚
240˚
REAR
210˚ 180˚
Fig. 3a
16.00"
Swivel Mount
1.15"
3.15"
10K
30˚
60˚
90˚
120˚
500-5000 Hz
200 Hz
10,000 Hz
150˚
Microphone