Shure SM80 User Manual

THE SOUND OF THE PROFESSIONALS@

GENERAL

The Shure Model SM80 is a high-quality, omnidirectional condenser microphone designed for the most demanding professional applications in studio recording, broadcasting and sound reinforcement. It is especially suitable for applications requiring extremely wide frequency response, low noise and distortion characteristics, very low RF susceptibility, and reliable operation over a wide range of temperature and humidity extremes. The SM80 features a selectable 10 dB attenuator and a three-position low-frequency response switch. The case is constructed of steel for ruggedness, with a stainless steel screen, and finished in durable vinyl paint.

The SM80 is designed for phantom (simplex) powering from an external supply such as the Shure Model PS1A, or directly from recording, broadcast or sound reinforcement equipment. The SM80 operates over a wide voltage range covering both DIN Standard 45 596 phantom voltages of 12 and 48 volts.

The microphone is supplied with a highly efficient pop filter grille (Model A81G), attenuator lock, and swivel adapter. Also available for use with the SM80 are a unidirectional microphone cartridge (Model R104), a heavy-duty windscreen (Model A81WS), and a compact, lightweight microphone stand (Model S15) capable of being extended to 4.3m (14 ft). A dual-channel power supply (Model PS1A) is available for providing phantom power to the SM80.

PROFESSIONAL PRODUCTS

SPECIFICATIONS

Type

Omnidirectional condenser (electret bias)

Frequency Response

20 to 20,000 Hz (see Figure 1)

n Wide-range frequency response for exceptionally

accurate recording and sound reinforcement applications

n Low noise and high output clipping level char-

acteristics

n Low distortion characteristics over the entire audio

spectrum for a wide range of load impedances

Omnidirectional polar pattern is equally sensitive to

sounds from all directions

Very low RF susceptibility

n Selectable low-frequency response: flat, 6 or 18

dB/octave rolloff

n 10 dB attenuator accessible without disassembly;

lockable in either position

Wide-range phantom powering includes DIN 45 596

voltages of 12 and 48 Vdc

n Rugged construction for outstanding reliability

n Field-usable over wide range of temperature and

humidity conditions

VARIATIONS

Model SM80-LC: Supplied less cable.

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Omnidirectional (see Figure 2)

TYPICAL POLAR PATTERNS

FIGURE 2

Printed in U.S.A.

Patent Pending

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)

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

-65 dB (0.56 mV)

(0 dB = 1 volt per microbar)

Equivalent

Power Level

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

-40.5 dB

(0 dB = 1 milliwatt with 10 microbars)

Case

Steel construction with metallic vinyl paint finish and stainless steel screen

Dimensions

See Figure 3

Clipping Level

800-ohm Load 150-ohm

(at 1,000 Hz)

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

Load

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

- 4 dBV (0.63V)

- 15 dBV (0.18V)

Total Harmonic Distortion

Less than 0.5% (132 dB SPL at 250 Hz into 800-ohm

load)

Maximum SPL

(at 1,000 Hz)

137 dB (attenuator at 0); 147 dB (attenuator at 10)

with 800-ohm load

129 dB (attenuator at 0); 139 dB (attenuator at 10)

with 150-ohm load

Hum Pickup

-4 dB equivalent SPL in a 1 millioersted field (60 Hz)

Output Noise (equivalent sound pressure levels)

17 dB typical, A-weighted

20 dB typical, weighted per DIN 45 405

Signal-to-Noise Ratio

77 dB (IEC 179)* at 94 dB SPL

Overvoltage and Reverse Polarity Protection

Max. External Voltage Applied to Pins 2 and 3 with Respect to Pin 1 Reverse Polarity Protection

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

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

+ 52 Vdc

200 mA max.

(diode-clamped)

Phasing

Positive pressure on diaphragm produces positive

voltage on pin 2 relative to pin 3

Cartridge Capacitance

31 pF

LF Response Switch

Flat, -6 dB/octave below 100 Hz, -18 dB/octave below 80 Hz

Attenuator Switch

0 or 10 dB (68 pF)

Power

Supply Voltage . . . . . . . 11 to 52 Vdc, positive pins 2 and 3

Current Drain

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

1.0

mA to 1.2

Environmental Conditions

Relative Humidity 0 - 50%

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

-29° to 74°C

(-20° to 165°F)

Relative Humidity 0 - 95%

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

-29° to 57°C

(-20° to 135°F)

Connector

Professional three-pin audio**

OVERALL DIMENSIONS

FIGURE 3

Weight

Net

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

Packaged

*S/N ratio is difference between microphone output at 94 dB SPL and microphone

self-noise A-weighted.

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

equivalent connectors.

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

230

grams(8oz)

1.2kg(2lb10

oz)

OPERATION

The SM80 is designed for phantom powering by a

Shure Model PS1A Power Supply, or by virtually any

microphone power supply providing 12 to 48 Vdc phan-

tom voltage.

Use only high-quality cables, as intermittent shorts between broken shield wires and balanced conductors will cause extremely large noise transients in the system. Avoid ground loops due to grounded connector shells or the microphone case touching other grounded metal objects. Follow generally accepted audio grounding practices.

Paralleling or “Y-ing” the SM80 with another microphone (two microphones on the same input) is not recommended; separate inputs are preferable. However, paralleling two SM80’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 PS1A 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 micro-

phone 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, or between two microphones and a single power supply input. Note that a PS1A Power Supply can power two SM80’s on each input; other power supplies should

be checked to see if they can supply a minimum of 10 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

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