Shure SM89 User manual

MODEL SM89
CONDENSER SHOTGUN MICROPHONE
Model SM89 is a highly directionalcondenser shotgun
microphone with distant pickup characteristics suitable for
on-location film and television production. The SM89 can
also be used for theater sound reinforcement, spot news
coverage, or wildlife recording. The SM89 discriminates at
a distance in favor of desired dialogue or effects and
against ambient noise–even in noisy surroundings.
The on-axis frequency response of the SM89 is very
smooth and extended. For clarity and speech intelligibility,
a slight presence rise optimizes the high-frequency re-
sponse to compensate for high-frequency losses. A low-
frequency roll-off minimizes pickup of wind, mechanical
vibration, ambient noise, and rumble without affecting
voice frequencies.
The off-axis response of the SM89 is virtually free of
comb-filter effects. This is important when it is not possible
to aim the microphone precisely or when it is desirable to
pick up dialogue or sound from moving sources.
FEATURES
•
Designed especially for location film and TV prodution,
theater sound reinforcement, and spot news coverage
• Highly directional polar pattern optimized for distant
pickup
• Smooth, wide on-axis response
• Greatly suppressed side pickup with minimum comb-
filter effects
• Two low-cut frequencies, switch selectable
• Low impedance, high sensitivity
• Extremely low hum, noise, and RF pickup
• Uses readily available 11 to 52 Vdc phantom supply
• Rugged and reliable, operates over wide range of tem-
perature and humidity
• Extremely lightweight, can be suspended on fishpole for
long periods of time without operator fatigue
• Aircraft-grade materials used throughout
• Supplied with foam windscreen and strong luggage-
grade carrying case
SPECIFICATIONS
Type
Pressure gradient/line combination
Transducer
Condenser
Frequency Response
60 to 20,000 Hz (see Figure 1*)
*Curves shown at 1.8m (6 ft)
TYPICAL ON-AXIS FREQUENCY RESPONSE
FIGURE 1
Model SM89 User Guide
27B2365 (AC)
2001, Shure Incorporated Printed in U.S.A.

Polar Pattern
Hypercardioid at low frequencies, lobar at frequencies
above 1 kHz, symmetrical about axis (see Figure 2*)
*Curves shown at 1.8m (6 ft)
TYPICAL POLAR PATTERNS
FIGURE 2
Output Impedance
Rated at 150 Ω(100 Ωactual)
Recommended minimum load: 800 Ω(May be used
with loads low as 150 Ωwith reduced clipping level)
Output Level (at 1,000 Hz)
Open Circuit Voltage –53 dB (2.2 mV). . . . . . . . . . . . . .
0 dB = 1V/µbar
Output Clipping Level (at 1,000 Hz, under 0.5% THD)
800 Ωload: –1 dBV (0.89 V)
150 Ωload: –12 dBV (0.25 V)
Maximum SPL (at 1,000 Hz, under 0.5% THD)
800 Ωload: 127 dB SPL
150 Ωload: 119 dB SPL
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
Dimensions
See Figure 3
OVERALL DIMENSIONS
FIGURE 3
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.
BLOCK DIAGRAM
FIGURE 4
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 loca-
tion, the SM89 can be aimed so that the noise source is en-
tirely off-axis to the microphone even if this puts the desired
source up to 30off-axis. The noise pickup will then be mini-
mal, and the SM89 will pick up the desired source with slight-
ly diminished high-frequency response (see Figure 5).
*Curves shown at 1.8m (6 ft)
COMPARISON OF 30AND 90OFF-AXIS
RESPONSE OF SM89
FIGURE 5

However, because the 30off-axis response is smooth,
simple equalization can compensate for its decreased high-
frequencies if necessary. The curve below (Figure 6) shows
the SM89 response at 30off-axis, with the equalization that
can be used to restore the high-frequency response.
TYPICAL SM89 RESPONSE, 30OFF-AXIS
FIGURE 6
Additionally, because of such off-axis characteristics,
the SM89 can be used for pickup at greater angles off-axis
than is possible with other shotgun microphones. This fea-
ture permits deliberately locating the desired source up to
30off-axis in order to ensure that an undesired source is
entirely off-axis and will not be picked up. Changes in fre-
quency response above 1,000 Hz can then be compensated
by simple equalization if necessary.
Pickup (and cancellation) is symmetrical about the mi-
crophone axis; it is unchanged when the microphone is ro-
tated about its own axis. In addition to its acoustical and
electrical properties, the SM89 is extremely lightweight. This
makes it easier for an operator to hold it on a fishpole for ex-
tended periods of time, for instance, during lengthy takes.
The microphone length is optimized in relation to its direc-
tional characteristics and ease of handling. Its aircraft-grade
materials withstand rough handling, and its unique internal
construction provides excellent wind noise rejection while
protecting against damage to the transducer or electronics.
The SM89 is supplied with a foam windscreen for use
when the microphone is subject to quick boom motion, or
when air conditioning or other indoor wind noises may be a
problem. A rugged carrying case is also supplied. An option-
al accessory is a specially designed shock-mount virtually
eliminating mechanical vibration pickup.
The SM89 is field serviceable. The handle separates by
unscrewing from the head; the interconnection is gold-
plated and extremely reliable.
ACCESSORIES
The supplied windscreen is useful under most indoor-
conditions where minimal wind noise due to boom motion,
air conditioners, or heater fans is present. When structure-
borne mechanical vibration must be cancelled, the optional
Model A89SM Shock-Mount can be used. And for mounting
on a conventional microphone stand, use the Shure A57F
Swivel Adapter.
SM89 WITH WINDSCREEN, CARRYING CASE, AND SHOCK
MOUNT ADAPTER
FIGURE 7
IMPORTANT: To avoid degrading the response of the
SM89, never cover its grille perforations with anything ex-
cept acoustically transparent windscreen material.
FURNISHED ACCESSORIES
Carrying Case 90A4684. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foam Windscreen RK257WS. . . . . . . . . . . . . . . . . . . . . . . .
OPTIONAL ACCESSORIES
Shock Mount A89SM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Swivel Adapter A57F. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPLACEMENT PARTS
Head Assembly R144. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle Assembly 90A3123. . . . . . . . . . . . . . . . . . . . . . . . .
RFI Filter and Plug Element 90A3127. . . . . . . . . . . . . . . .
For additional service or parts information, please contact
Shure’s Service department at 1-800-516-2525. Outside the
United States, please contact your authorized Shure
Service Center.

SHURE Incorporated Web Address: http://www.shure.com
222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A.
Phone: [phone] Fax: [phone]
In Europe, Phone: [phone] Fax: [phone]
In Asia, Phone: [phone] Fax: [phone]
Elsewhere, Phone: [phone] Fax: [phone]