Description - Shure SR109 Operation And Service Manual

SR109 Professional Mixer
DESCRIPTION
The Shure Model SR109 Professional Mixer is a solid-
state, eight-channel microphone mixer-preamplifier that
enables the operator to mix as many as eight microphones
with individual control over input attenuation, volume and
high- and low-frequency equalization. The Mixer has three
outputs: a program output, an accessory output and a
headphone output. In addition, channels 7 and 8 contain
switch-selectable inputs for use with either low-impedance
microphones or line level sources. A master volume con-
trol regulates program output.
The program output has both a 600-ohm, balanced line
level output and a low-impedance, balanced, microphone
output. The headphqne output is an &ohm balanced output
with separate volume control. A pair of link jacks facilitate
connection to an additional mixer, or external equipment
such as compressors, limiters or equalizers.
The SR109 rear panel contains provisions for connection
to one or more Shure SR110 Professional Monitor Mixers.
The SR110 is a self-contained, eight-channel, line level
mixer designed to provide a separate stage monitor mix
that follows the program mix levels. In addition, it may be
used in multi-track recording as a submaster mix panel or
mixdown panel.
The SR109 contains a peak-responding, adjustable out-
put limiter with an in-out switch and an indicator lamp
that flashes when the limiter is operating. The front panel
also contains an overload indicator lamp that signals when
the output is clipping in the non-limiting mode.
The Mixer contains a VU meter and a meter sensitivity
switch to adjust sensitivity to indicate program output level.
A built-in 1 kHz tone oscillator facilitates synchronization
of all meters in a system. A front-panel trim strip provides
space for pencilled notations.
The regulated power supply is designed to operate
over a wide range of ac line voltages, permitting the use
of extremely long ac extension cables without performance
degradation. Accessory equipment drawing up to 500 watts
may be connected to the rear-panel switched ac
receptacle (SR109 only).
The solid-state components in the SR109 Professional
Mixer are protected against damage as a possible result
of open-circuit or short-circuit conditions on the inputs or
outputs. All components are conservatively rated and are
operated well within their respective ratings to assure
long life and trouble-free performance.
The Mixer is supplied with rack-mounting screws and
spare fuses.
The Mixer is Underwriters' Laboratories, Inc., listed,
and is listed by the Canadian Standards Association as
certified (SR109 only).
The following are designed for use with the SR109 Pro-
fessional Mixer:
SR110 Professional Monitor Mixer
A1 05A Carrying Case