Crown Audio LM-300AL, LM-LM301A, LM-300A User Manual

POLAR
PATTERN

LM-300A
LM-300AL
LM-301A

®

he Crown
LM-301A are dual gooseneck micro­ phones for lecterns, pulpits or similar ap-

T

plications. Each professional quality mic is an
electret condenser type with a super­cardioid pickup pattern.

The LM-300A has a built-in electronics module
with an XLR connector. It plugs directly into
a female 3-pin XLR-type panel connector. The
LM-300AL is the same but with a 4-3/4-inch
longer boom arm.

The LM-301A has a built-in 5/8-inch (15.88­mm)-27 threaded collar that can be screwed
onto a mic stand, mic boom or an Atlas AD-12
male fl ange. Because of the unique design of
the mounting collar, the mic cable can be rout­ed either outside or inside the mounting collar.
The LM-301A comes in two parts: microphone/
cable and a cylindrical electronics housing.

Because of their supercardioid pickup pattern,
these microphones reject more background
noise, room reverberation, and feedback than a
typical cardioid microphone.

The LM Series have a smooth, wide-range fre­quency response for natural reproduction of the
singing or speaking voice. Very low frequencies
are fi ltered out to reduce pickup of mechanically
induced noise, room rumble, etc. The goose­neck adjusts silently.

Supplied with the microphone is the WS-9, a
highly effective foam pop fi lter. Its two-stage
design greatly reduces explosive breath sounds.
A low-cut switch built into the electronics hous­ing further reduces breath pops and handling
noise.

The microphone output is a male 3-pin XLR­type connector and is balanced, low impedance,
which allows long cable runs without hum
pickup or high-frequency loss. Superior RFI
protection is also provided.

LM-301A Operating Instructions

Please refer to Fig. 3, LM-301A, to identify the
parts mentioned.

1. To route the mic cable inside the mounting
device: remove the TA3F connector, push the
collar up onto the gooseneck and pull the cable
down through the collar. Reattach TA3F.

2. To route the mic cable outside the mounting
device: remove the TA3F connector, push the
collar up onto the gooseneck, route the end of
the cable inside the collar and slot and pull the
cable up through the collar and slot. Reattach
TA3F. (Continued on back)

LM-300A, LM-300AL and

SUPERCARDIOID CONDENSER
DUAL GOOSENECK
LECTERN MICROPHONES

ddLM-300A

LM-301A

Specifi cations

Typ e: Unidirectional condenser.
Element: Electret condenser.
Frequency response (typical): 80 Hz to 15,000 Hz

(110 Hz to 15,000 Hz with low cut). See Fig. 1.

Polar pattern: Supercardioid. See Fig. 2.
Impedance: 150 ohms, balanced. Recommended

minimum load impedance 1000 ohms.

Open-circuit sensitivity: 6 mV/Pa* (–44.5 dB re
1 V/Pa*).

Power sensitivity: –42 dB re 1 mW/Pa*.
Equivalent noise level: 28 dB SPL typical

(0 dB=.0002 dyne/cm

S/N ratio: 66 dB at 94 dB SPL.
Maximum SPL: 120 dB SPL produces 3% THD.
Polarity: Positive pressure on the diaphragm pro-

duces a positive voltage on pin 2 with respect to
pin 3 of the output connector.

Operating voltage: Phantom power, 12 to 48 volts

DC, positive voltage on pins 2 and 3 with respect to
pin 1 of the output connector.

Current drain: 3.5 mA.
Cable (LM-301A only): 10' (3.05-m) 2-conductor

shielded 0.1" diameter cable integral to microphone
terminated with Switchcraft TA3F.

Connectors (LM-300A, LM-300AL): 3-pin male XLR

type in electronics interface.

Connectors (LM-301A): Switchcraft TA3F on mic

cable, TB3M and 3-pin male XLR type in electronics
interface.

Safe operating temperature range: –10° to +50° C,

or +14° to +122° F.

Materials: Steel housing and gooseneck.
Finish: Black.

2

), A-weighted.

LM-300AL

Features

• Ideal for lecterns, pulpits and conference
tables

• Silent operating goosenecks

• Supercardioid pickup pattern reduces
feedback

• Slim, elegant design and natural sound

• LM300A and LM300AL (longer) have built­in XLR connectors

• LM-301A has threaded collar

Weight:
LM-300A: 5.0 ounces (145 grams).
LM-300AL: 5.5 ounces (159 grams).
LM-301A: 5.5 ounces (159 grams).
Dimensions: See Fig. 3 on reverse side.
Included accessories: WS-9 foam pop fi lter (Fig. 4).
Optional accessories: WS-5 foam windscreen,

PH-1A phantom power supply (1 channel, battery
or AC adaptor powered), ASA-4 mic stand adapter
for LM-300A and LM-300AL.

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

Fig. 1

Frequency Response

Frequency in Hz

Fig. 2

Polar Response

All Models: Operating Instructions

1. Plug the electronics interface into a 3-pin
XLR-type connector with its cable routed to the
audio mixer.

2. At the mixer, plug the mic cable from the
lectern into an input with 12-48 volt phantom
power. Make sure the phantom power switch on
the mic is on.

3. If phantom power is not available on your
audio mixer, connect the mic cable from the
microphone to an external phantom power sup­ply such as a Crown PH-1A. Connect another
mic cable between the phantom power supply
output and a mixer mic input.

4. If mechanical noise or breath pops are exces­sive, use a pen or pencil to set the fl at/low-cut
switch in the electronics interface to “cut”
( ). Push the switch up to enable low cut.

5. Do not lubricate the gooseneck.

Architects’ and Engineers’ Specifi cations

The microphone shall be the Crown model
LM-300A, LM-300AL, or LM-301A. The micro­phone shall be a supercardioid electret-con­denser type with dual silent goosenecks.

Frequency response shall be uniform from
80 Hz to 15,000 Hz. The microphone shall be
powered from 12 to 48 volts phantom power­ing. Open-circuit sensitivity shall be 6 mV/Pa.
Impedance shall be 150 ohms balanced.

Maximum SPL capability shall be 120 dB SPL at
3% THD. Equivalent noise shall be 28 dBA typi­cal (0 dB =.0002 dyne/cm

2

).

In the LM-300A and LM-300AL, electronics and
connector for the microphone shall be in a rug­ged steel cylindrical housing at the end of the
gooseneck. A fl at/low-cut switch shall be built
into the electronics housing.

In the LM-301A, electronics and connector for
the microphone shall be in a separate rugged
steel cylindrical housing. A fl at/low-cut switch
shall be built into the electronics housing. A
TA3F connector at the end of the mic cable shall
connect to the electronics. The microphone
shall have a built-in

5

/8-inch (15.88-mm)-27
threaded collar that screws onto a mic stand,
mic boom or Atlas AD-12 male fl ange. The
cable can be routed either outside or inside the
mounting device.

The Crown Model LM-300A, LM-300AL, or LM­301A microphone is specifi ed.

3"

(5.8 cm)

1.446"

(3.7 cm)

9.68"

(24.6 cm)

3"

(5.8 cm)

Total Length 22"

(55.9 cm)

LM-300AL

LM-300A
LM-300AL
LM-301A

Warranty

Crown professional microphones are guaran­teed against malfunction for a period of three
years from date of original purchase. See
enclosed warranty sheet for additional informa­tion.

Service

If the microphone does not function properly,
replace or repair mic cables and connectors,
check the power supply.

If you determine the microphone product(s)
is defective, return the complete product (mic
and interface) in its original packaging to Crown

Factory Service, 1718 W. Mishawaka Road,
Elkhart, IN 46517-9439.

A Service Return Authorization (SRA) is re­quired for product being returned for service.
An SRA can be completed on line at:
www.crownaudio.com/support/factserv.htm.

The mic and electronics are a matched pair.
Do not separate them. For service send them
both in.

For further assistance or technical support call

800-342-6939.

4

Fig.

WS-9 Foam Pop Filter

Fig. 3 Dimensions

(5.8 cm)

4.75"

(12.1 cm)

3"

(5.8 cm)

Total Length 17.25"

(43.8 cm)

ddLM-300A

4.86"

(12.3 cm)

4.86"

(12.3 cm)

3"

1.446"

(3.7 cm)

LM-301A

Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]

©

Specifi cations subject to change without prior notice. Latest
information available online at www.crownaudio.com.
Crown and Crown Audio are registered trademarks of Crown
International, Inc.

5/08 136563-3

FAX: [phone]FAX

2008 by Crown Audio®, Inc.