Crown LM-201 User manual

LM-201
SUPERCARDIOID CONDENSER
LECTERN MICROPHONE
Horizontal-Plane Polar Response
Fig. 2
Fig. 3a
Fig. 1
Frequency Response
Frequency in Hz
The Crown®LM-201 is a professional-
quality, supercardioid electret con-
denser microphone designed for use
on lecterns, pulpits, or similar applications.
The microphone is easily installed with
wood screws or bolts. As it is swiveled to
the desired position, adjustment is far qui-
eter than conventional gooseneck micro-
phones. Swivel motion is limited to prevent
cable damage. The LM-201 is rugged, and is
built to withstand daily use.
Because of its supercardioid pickup pattern,
the LM-201 rejects background noise and
room reverberation, improving gain-before-
feedback more than a microphone with a
cardioid pattern.
The LM-201 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 and mic
capsule are shock-mounted to attenuate
handling 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-
201) or brown (model LM-201B).
Operating Instructions
The LM-201 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-inch-diameter
(3.175-mm) holes for the mounting screws
(supplied).
Your pulpit might already have mounting
holes that fit the LM-201. If these holes are
oriented opposite to those in the LM-201
base, simply remove the Phillips 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 ½-inch-diameter (12.7-mm)hole in
the lectern top in the center of the three 1/8-
Specifications
Type: Unidirectional condenser.
Element: Electret condenser.
Frequency response (typical): 100 Hz to 15,000 Hz. See
Fig. 1.
Polar pattern: Supercardioid. See Fig. 2.
Impedance: 150 ohms nominal (120 ohms actual),
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: 24 dB SPL typical (0 dB=.0002
dyne/cm2), A-weighted.
S/N ratio: 70 dB at 94 dB SPL.
Maximum SPL: 120 dB SPL for 3% THD.
Polarity: Positive pressure on the diaphragm produces a
positive voltage on XLRM pin 2 with respect to pin 3.
Operating voltage:
Option 1: Phantom power, 12 to 48 volts DC, positive
voltage on output pins 2 and 3 with respect to pin 1.
Option 2: 12-24 DC power supplied by a separate
AC/DC adapter such as Crown PS-24. You select this
option by moving jumpers inside the electronics
module (instructions inside cover).
Current drain: 5.8 mA.
Materials: Polycarbonate swivel mount and ball, steel
tube and grille, steel electronics module.
Finish: Black (LM-201) or brown (LM-201B).
Cables: Grey, permanently attached, 2-conductor
shielded cable, terminated with spade lugs for
connection to electronics module. Six-and-one-half
feet (2 meters) long from swivel mount to spade lugs.
Black, permanently attached, 2-conductor shielded
cable, 18 inches (0.5 meters) long, with 3-pin male
XLR audio connector.
Weight (microphone and cable only): 10.2 ounces
(288.3 grams).
Weight (microphone, cable, and electronics module):
18.2 ounces (515 grams).
Dimensions: See Figs. 3a, 3b and 3c.
Included accessories: Foam windscreen, Crown part no.
WS-8.
Optional accessories: PH-1A phantom power supply
(1 ch., battery or AC adapter powered), PH-4B
phantom power supply (4 ch., AC powered).
*1 Pascal = 10 dynes/cm2= 10 microbars = 94 dB SPL.
16.00"
(40.6 cm)
1.15"
(2.9 cm) 3.15"
(8.0 cm)

Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: [phone]
FAX: [phone]FAX
@crown®
LM-201
©1998 Crown International, Inc.
Specifications subject to change without prior notice.
Crown®is a registered trademark of Crown Interna-
tional, Inc.
10/98 125958-2
Fig. 3c
LM-201 Schematic
inch-diameter (3.175-mm) holes. The micro-
phone cable will run through this hole.
Alternatively, you can run the cable along the
top of the lectern and down the side, so that
no cable hole is needed.
3. Using the supplied mounting screws and
washers, screw the swivel mount to the
lectern top. Tighten the mounting screws
securely. Do not overtighten. Some slight
wobbling of the base is normal when the
microphone is moved.
4. For unlimited microphone rotation, re-
move the set screw in the base of the micro-
phone. Caution: If the boom arm is rotated
fully around, it may twist the cable and break
it.
5. Using woodscrews, mount the base plate
of the electronics module inside the lectern
or wherever desired. You can remove the
module cover by undoing the screws on the
side of the module.
Powering: The LM-201 is factory set for
use with 12-48 volt phantom power. To
change to 12-24 volt DC power, see in-
structions inside electronics module cover.
Connections: Connect the LM-201 cable
spade lugs to the electronics module as
shown in Figure 3b. Plug mixer cable into
XLRM output connector (see Figure 3c).
Warning: Do not lubricate the microphone
swivel mount, as it may lose its friction
and not stay in place. Use only mild soap
and water to clean the microphone.
Tension Adjustment: If the swivel becomes
loose, remove the swivel mount from the
lectern and look under the mount. You’ll see
a ring with two holes 180 degrees apart.
Place the tips of a needlenose pliers in these
holes, and rotate the ring clockwise until the
swivel is sufficiently tight. Remount the unit.
Architects’ and Engineers’ Specifications
The microphone shall be the Crown model
LM-201 or equivalent. The microphone shall
be a supercardioid electret-condenser type
with shock-mounted capsule, a built-in
shock-mounted swivel mount and pop-filter
grille. Permanently attached to the micro-
phone shall be a 6.5-ft (2-m), two-conductor
shielded cable that connects to a supplied
electronics module. The output of the elec-
tronics module shall have an 18-in. (0.5-m)
microphone cable terminated with an XLRM
audio connector.
The microphone shall be powered from 12
to 48 volts phantom powering or 12-24
volts DC. Frequency response shall be
uniform from 100 Hz to 15,000 Hz. Open-
circuit sensitivity shall be 6.0 mV/Pa. Im-
pedance shall be 150 ohms balanced.
Maximum SPL capability shall be 120 dB
SPL at 3% THD. Equivalent noise shall be 24
dBA typical (0 dB =.0002 dyne/cm2).
The LM-201 shall have a black finish; the
LM-201B shall have a brown finish.
The Crown Model LM-201 or LM-201B
microphone is specified.
Microphone Warranty
Crown professional microphones are guar-
anteed unconditionally against malfunction
from any cause for a period of three years
from date of original purchase. See enclosed
warranty sheet for additional information.
Service
If the unit fails to work, replace or repair any
additional mic cables, or check the power
supply. If service is required, return both the
microphone and its interface in their original
packaging to Crown Service Department,
Plant 2SW, 1718 West Mishawaka Road,
Elkhart, IN 46517. For further assistance or
technical support call 800-342-6939.
At the factory, the electronics module is
matched to your particular microphone’s
frequency response. If you determine that
just the microphone or the module needs
service, send both anyway. Then we can
match your electronics to your micro-
phone. The serial number is on both
pieces.
3.055"
(7.8 cm)
1.950"
(4.95 cm)
1.250"
(3.2 cm)
3.500"
(8.9 cm)
2.00"
(5.1 cm) 2.80"
(7.1 cm)
Fig. 3b