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However, because the 30° off-axis response is smooth, simple
equalization can compensate for its decreased high frequencies
if necessary. The curve below 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
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 feature 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 frequency response above 1,000 Hz can then be
compensated by simple equalization if necessary.
Pickup (and cancellation) is symmetrical about the microphone
axis; it is unchanged when the microphone is rotated 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 shpole for extended periods of time, for instance, during
lengthy takes. The microphone length is optimized in relation to
its directional 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 optional accessory is a specially designed
shock-mount virtually eliminating mechanical vibration pickup.
The SM89 is eld 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
IMPORTANT: To avoid degrading the response of the SM89,
never cover its grille perforations with anything except acoustically
transparent windscreen material.
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC
Directive 89/336/EEC. Meets applicable tests and performance
criteria in European Standard EN55103 (1996) parts 1 and 2, for
residential (E1) and light industrial (E2) environments.
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.