Shure SM82 User Guide

THE SOUND OF THE PROFESSIONALS® PROFESSIONAL PRODUCTS

The Model SM82-LC is a hand-held, self-contained, unidirectional, condenser microphone containing its own line level amplifier, peak limiter, and battery. It is designed to provide a line level output for use in a variety of broadcasting situations where a line level microphone with a built-in limiter is required.

Microphone Features:

nWide range frequency response for exceptionally clean and natural sound reproduction

nCardioid polar pattern, uniform with frequency and symmetrical about axis, to provide maximum rejection and minimum coloration of off-axis sound

nBalanced line level output can directly drive telephone lines or other line level inputs

nBuilt-in peak limiter controls output level to prevent microphone line amplifier or external equipment overloading

nInternal 9.8V battery operation

nPhantom powering over a 15V to 50V range

nAutomatic switchover from phantom to battery power

nSolid-state line level amplifier output

nBuilt-in “pop” and wind filter protects against wind and explosive breath sounds

n Unidirectional condenser transducer

nOutput connector/switch turns microphone on when cable connector is inserted

27A1103 (FD)

nRugged construction for outstanding reliability

nCan be used over wide range of operating temperatures and humidity conditions

nVery low mechanical handling noise

The Model SM82 was designed to fill the need for a rugged, reliable line level microphone for broadcast applications. Intensive laboratory development and testing in major broadcast studios and remote pickup sites complemented the field-derived specifications and features, resulting in an optimum design to meet a variety of broadcast needs.

The exceptional performance and unique features of the SM82 make it an outstanding choice for such applications as:

nSingle-Channel Remotes-without separate remote amplifier.

n“Dialed-Up” Telephone Reports - internal resistance holds “dialed-up” line.

nLong-Run Microphone Lines for Parades, Political Events, Golf Tournaments or Other Live Remotes - using unshielded cable.

nSports Announcing-limiter prevents overloading of remote broadcast amplifier.

The SM82 is supplied with an accessory foam windscreen, swivel adapter, and mercury battery.

SPECIFICATIONS

Type

Cardioid condenser with line level amplifier and limiter

Frequency Response

40 to 15,000 Hz (see Figure 1)

Polar Pattern

Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis (see Figure 2)

Output Impedance

250 ohms actual (designed for use with 600-ohm or greater loads)

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Printed in U.S.A.

U.S. Patents 4,000,370 and D239,722

	POLAR PATTERNS
	FIGURE 2
Output Level (1000 Hz response)
Open circuit	voltage: -23 dBV (0.11V) for 74 dB
SPL (0 dBV = 1 volt)
Power output:	-4 dBm into 600 ohms for 94 dB
S P L

(0 dBm = 1 mW in 600 ohms)

Limiter

Threshold: + 6 dBm (approx. 104 dB SPL) (Figure 3) Attack time: Typically 5 msec for 10 dB input change

Release time: Typically 330 msec for 10 dB input change

Range: 20 dB

Output clipping level: + 10 dBm

Total Harmonic Distortion (1000 Hz response at +4 dBm output level)

1% or less (below limiting)

Hum Sensitivity

Less than -125 dBm in 1 millioersted field (ref: Power Output specification)

Output Noise

Equivalent to 37.5 dB SPL with weighting per DIN

45405

Phasing

Positive pressure produces positive voltage on pin 2 with respect to pin 3

Power

Battery:

Type: 9.8V Mercury (Duracell TR177 or equivalent)

Average Life: 90 hours Minimum Voltage: 8.5 Vdc

Current Drain (typical): 2.5 mA (idle); 8 mA max. (full signal)

Phantom Voltage: See Figure 5 Current Drain (typical): 16 mA

Operating Conditions

Temperature: - 12° to 57°C (10° to 135°F) (battery operation); -23° to 57°C (- 10° to 135°F) (external supply operation)

Relative humidity: 5 to 98% over temperature ranges specified above

LIMITER THRESHOLD

FIGURE 3

Storage Temperature: Up to 74°C (165° F) without appreciable change in performance

Microphone Overload and Shorting Protection

Shorting: Shorting output (even for prolonged periods) will produce no damage, but may shorten battery life

Maximum external voltage applied to pins 2 and 3 with respect to pin 1: 22V

Maximum external voltage applied between pins 2 and 3: 44V

Connector

Professional three-pin audio connector* with built-in on-off switch (depressing pin 1 turns microphone on)

Case

Stainless steel housing, brass and brazed steel grille

Case Finish

Bronze vinyl enamel with dull chrome grille screen

Dimensions

See Figure 4

OVERALL DIMENSIONS

FIGURE 4

Net Weight

406 grams (14.4 oz) with battery

Shipping Weight

834 grams (29.4 oz)

*Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) series or equivalent connector.

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