Crown Audio LM-LM301A specifications DdLM-300A LM-301A, LM-300AL Features, Specifications

POLAR

PATTERN

LM-300A

LM-300AL

LM-301A

SUPERCARDIOID CONDENSER DUAL GOOSENECK LECTERN MICROPHONES

he Crown® LM-300A, LM-300AL and TLM-301A are dual gooseneck micro-

phones for lecterns, pulpits or similar ap- plications. Each professional quality mic is an electret condenser type with a super- cardioid 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 (15.88- mm)-27 threaded collar that can be screwed onto a mic stand, mic boom or an Atlas AD-12 male flange. Because of the unique design of the mounting collar, the mic cable can be rout- ed 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 fre- quency response for natural reproduction of the singing or speaking voice. Very low frequencies are filtered out to reduce pickup of mechanically induced noise, room rumble, etc. The goose- neck adjusts silently.

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

The microphone output is a male 3-pin XLR- type 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)

ddLM-300A

LM-301A

Specifications

Type: 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/cm2), A-weighted. 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.

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 built- in 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 filter (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