Shure SM85 User Guide

GENERAL

The Shure Model SM85 is a professional-quality, hand-held, unidirectional condenser microphone designed for the most demanding applications in sound reinforcement, broadcasting and studio recording. It is especially suitable for applications requiring wide frequency response, low distortion characteristics, very low RF susceptibility, and reliable operation over a wide range of temperature and humidity extremes. The

SM85 makes optimum use of proximity effect to give the performer control of low-frequency sound, from the warm intimacy of close normal-to-distant

miking to the natural sounds of

miking. The SM85 also features an integral wind and pop filter, a high-frequency presence peak, a controlled low-frequency

rolloff, and an effective shock mount for reduced stand and handling noise. The case is constructed of aluminum for light weight and ruggedness, with a steel grille and durable black finish.

The SM85 ing from an external supply or directly from sound forcement, broadcast, or recording equipment. The SM85 operates over an extremely wide voltage range of 11 to 52 Vdc, covering both DIN Standard 45 596 simplex voltages of 12 and 48 volts, and the proposed 24-volt standard.

designed for simplex (phantom) power-

rein-

SPECIFICATIONS

Type

Cardioid condenser (electret bias)

Frequency Response

50 to 15,000 Hz (see Figure 1)

The microphone is supplied with an accessory swivel adapter. Model and Model

SM85-LC is supplied without a cable,

SM85-CN is supplied with a 7.6m (25 ft) TRIPLE-FLEX@ microphone cable with professional audio connectors. Two dual-channel power supplies (Models PSI and PSlE2) are available for providing simplex power to the

Model

SM85

Features:

SM85.

Wide-range frequency response tailored for professional vocal applications

Built-in wind and pop filter minimizes undesirable

;+lo

-I0

FREWENCY IN

lpo0 l0,OW

HERTZ

wind and breath sounds Controlled low-frequency rolloff to reduce low-

frequency handling noise and compensate for prox-

imity effect

Polar Pattern

TYPICAL FREQUENCY RESPONSE

FIGURE

Transducer element shock-mounted for reduced Cardioid (unidirectional) response- uniform with frestand and handling noise

Low distortion output and wide dynamic range

characteristics for a variety of load impedances Cardioid polar pattern, uniform with frequency and

symmetrical about axis, to provide maximum rejection and minimum coloration of off-axis sounds

Very low RF and magnetic hum susceptibility

Wide-range simplex powering includes DIN 45 596 voltages of 12 and 48 Vdc

Rugged construction for outstanding reliability Field-usable over wide range of temperature and

humidity conditions

quency, symmetrical about axis (see Figure

Output Impedance

Rated at 150 ohms (85 ohms actual) Recommended minimum load impedance: 800 ohms

(May be used with loads as low as 150 ohms with reduced clipping level)

Output Level

Open Circuit Voltage

(at 1,000 Hz)

. . . . . .

. .

-74

(0 dB = 1 volt per microbar)

Clipping Level

800-ohm Load . . . .

150-ohm Load

(at 1,000 Hz)

. . . . . . . . . . . .

. . . . . .

. .

. . . . . .

. . .

15 dBV

dB (0.2 mV)

dBV (0.63V)

(0.18V)

20,000

gum

222 HARTREY

Copyrtght

27A1992

1983. Shure Brothers

(CK)

AVE

EVANSTON

Inc

60204

S A AREA

CODE 3121866-2200

CABLE

SHUREMICRO

TWX

910-231-0048

TELEX

Printed In

72-4349

U.S.A.

TYPICAL POLAR PATTERNS

FIGURE 2

Total Harmonic Distortion

Less than 0.25% (130 dB SPL at 250 Hz into 800-ohm load)

Maximum SPL

142 dB with 800-ohm load 134 dB with 150-ohm load

Hum Pickup

-7.5 dB equivalent SPL in a 1 millioersted field (60

Hz)

Output Noise

measured with true

(equivalent sound pressure levels;

rms voltmeter)

29 dB typical, A-weighted

32 dB typical, weighted per DIN 45 405

Dynamic Range

113 dB (maximum SPL to A-weighted noise level)

Signal-to-Noise Ratio

65 dB (IEC 179)* at 94 dB SPL

Overvoltage and Reverse Polarity Protection

Max. External Voltage Applied to Pin 2 and 3 with Respect to Pin Reverse Polarity Protection

.........

,200 mA max.

(diode-clamped)

Phasing

Positive pressure on diaphragm produces positive

voltage on pin 2 relative to pin 3

Cartridge Capacitance

27 pF

Power

Supply Voltage Current Drain

.ll

to 52 Vdc, positive pins 2 and 3

..................

.1.0 mA to 1.2 mA

Environmental Conditions

Relative Humidity 0-50°/o

..........

-2g0 to 74OC

(-20' to 165OF)

Relative Humidity 0-95%

..........

-2g0 to 57OC

(-20' to 135OF)

Connector

Three-pin professional audio**

Case

Aluminum construction with black finish and black steel grille

Dimensions

See Figure 3

52 Vdc

OVERALL DIMENSIONS

FIGURE

Weight

Net

..........................

Packaged

.........

SM85-LC: 887 grams (1 lb 15 oz)

,180 grams (6.3 oz)

SM85-CN: 1.47 kilograms (3 Ib 4 oz)

Cable

(Model SM85-CN)

(25 ft), two-conductor, shielded, TRIPLE-FLEX@

7.6m with three-pin and three-socket professional audio connectors (microphone connector is black finish)**

OPERATION

The SM85 is designed for simplex powering by a

Shure Model

PSI or PSlE2 Power Supply, or by virtually any microphone power supply providing 12 to 48 Vdc simplex voltage, or by any microphone mixer (such as the Shure M267 and

M268) with a simplex supply.

Use only high-quality cables, as intermittent shorts between broken shield wires and balanced conductors will cause objectionable noise transients in the system. Paralleling or "Y-ing" the

SM85 with another microphone (two microphones on the same input) is not recommended; separate inputs are preferable. However, paralleling two

SM85's may be accomplished with either a reduction in maximum SPL and output level, or a reduction only in output level if the microphones are electrically isolated. With the microphones paralleled either before or after a

PSI or PSI E2 Power Supply, the maximum SPL is reduced by approximately 10 dB and the output level by 6 dB. The reduction in maximum SPL can be avoided by using either two Shure

A15AS Attenuators and a Switchcraft 391Q43 Y-Adapter to isolate the microphones, or an isolation network as shown in Figure 4. The network reduces each microphone output level by 8 dB, while the A15AS reduces the output level by 5 dB plus the attenuator's 15, 20, or 25 dB (switch-selectable). The network or attenuators can be inserted between the power supply outputs and mixer input. Note that

PS1 or PSI E2 Power Supply can power two SM85's on each input; other power supplies should be checked to see if they can supply a minimum of 11 Vdc at each microphone when both microphones are connected.

A minimum load impedance of 800 ohms or greater should be used for maximum signal handling and minimum distortion. The load may be as low as 150 ohms, but a reduction in output clipping level will result.

should be noted that the power supply itself may add

loading (3300 ohms in the Shure

PS1 or PSlE2 power

supplies) to the microphone.

PSI and PSlE2 POWER SUPPLIES

Connect the microphone cable to the SM85 and the power supply MICROPHONE connector. The power supply uses the balanced audio cable pair to carry the supply current to the microphone, and the cable shield as a ground return.

'SIN ratio is difference between m~crophone output at

self-noise A-weighted.

"Designed to mate with Cannon XL series, Switchcraft

equivalent connectors.

dB SPL and microphone

G.)

series or

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