Shure specifications USING THE DIRECTIONAL QUALITIES OF THE SM89

Polar Pattern

Hypercardioid at low frequencies, lobar at frequencies above 1 kHz, symmetrical about axis.

150°	180°	150°		150°	180°	150°
120°		120°	120°			120°
90°		90°	90°			90°
	–20 dB				–20 dB
	–15 dB				–15 dB
60°	–10 dB	60°	60°		–10 dB	60°
	–5 dB				–5 dB
30°	0	30°		30°	0	30°
		250 Hz				2500 Hz
		500 Hz				6300 Hz
		1000 Hz				10000 Hz

TYPICAL POLAR PATTERNS

Curves shown at 1.8m (6 ft)

Output Impedance

Rated at 150 Ω (100 Ω actual)

Recommended minimum load: 800 Ω (May be used with loads low as 150 Ω with reduced clipping level)

Sensitivity: (at 1,000 Hz)

Open Circuit Voltage . . . . . . . . –33 dBV/Pa (22.2 mV) 1 Pascal = 94 dB SPL

Dimensions

524 mm (20-5/8 IN.)

386 mm (15-3/16 IN.)

20 mm (25/32 IN.) DIA

OVERALL DIMENSIONS

Environmental Conditions

Operating Temperature: –29 to 57° C (–20 to 135°F)

Relative Humidity (Operating): 0 to 95%

Storage Temperature: –29 to 74° C (– 20 to 165°F)

Relative Humidity (Storage): Up to 80% at 74° C (165° F)

Net Weight

195 grams (6.9 oz)

POWERING THE SM89

The SM89 is designed for connection to widely available 11 to 52 Vdc phantom-powered microphone inputs. Suitable inputs are found in such Shure units as Mixer Models M267, M268, FP31, FP32, and FP42, Distribution Amp Model FP16, and Power Supply Model PS1A.

Output Clipping Level (at 1,000 Hz, under 0.5% THD)

800 Ω load: –1 dBV (0.89 V)

150 Ω load: –12 dBV (0.25 V)

Maximum SPL (at 1,000 Hz, under 0.5% THD)

800 Ω load: 127 dB SPL

150 Ω load: 119 dB SPL

CAPACITOR

CARTRIDGE

FET

IMPEDANCE

CONVERTER

	BALANCED
	TRANSFORMER
LF RESPONSE	CLASS A
	COMPOUND
FILTER
	AMPLIFIER
	REGULATOR/
	REVERSE
	VOLTAGE
	PROTECT

BLOCK DIAGRAM

RF1

FILTER

Hum Pickup

Under 3 dB equivalent SPL in 1 mOe field (60 Hz)

Output Noise

16 dB SPL typical, A-weighted

Signal-to-Noise Ratio

79 dB re 94 dB SPL

Dynamic Range

111 dB

Phasing

Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of microphone output connector

Power

Phantom voltage: 11 to 52 Vdc; 2 mA current drain

Low-Cut Filter

Recessed low-cut filter switch, 15 dB/octave cut below

60 Hz(—) or 160 Hz ( )

Case

Satin-black vinyl painted aluminum alloy handle and grille with stainless steel screen

USING THE DIRECTIONAL QUALITIES OF THE SM89

Because of its minimum comb-filter effects, the SM89 has a unique advantage over other shotgun microphones when good sound would otherwise be difficult or impossible to pick up. For instance, in a relatively nonreverberant location, the SM89 can be aimed so that the noise source is entirely off-axis to the microphone even if this puts the desired source up to 30° off-axis. The noise pickup will then be minimal, and the SM89 will pick up the desired source with slightly diminished high-frequency response.

COMPARISON OF 30 ° AND 90 ° OFF-AXIS RESPONSE OF SM89

Curves shown at 1.8m (6 ft)