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SR109

Professional Mixer

CONDENSED OPERATING INSTRUCTIONS

1. Set all switches and controls to OFF or 0.

2. Connect PROGRAM OUTPUT (LINE or MICRO-

PHONE LEVEL) to power amplifier, broadcast line

feed, etc. Connect speakers to power amplifier.

Connect headphones to PHONES Jack.

3. Connect sources (microphones, tape recorders,

etc.) to INPUT Connectors. Set Channel 7 or 8

MIC/LINE Switches as necessary.

4. Connect external signal-processing equipment

(compressor, equalizer, etc.) to LlNK Jacks. (To

connect two Mixers, connect LlNK OUT Jacks

together.)

Connect ac line to ac source.

Turn on POWER Switch and allow one to two min-

utes

warmup time.

7. Set 15 dB ATTENUATOR Switches to preliminary

position for type of material to be used

(0 for

speech or instrumental music, -15 for "hard"

rock music).

8. Set VU METER RANGE Switch for present applica-

tion:

0 for PA, +4 for recording, or

for broad-

cast.

9. Set MASTER Volume Control to 6. With source in-

put, raise Channel Volume Control for desired

sound level. Readjust ATTENUATOR Switch if

necessary.

10. Adjust HI and LO

FREQuency EQualization Con-

trols as necessary.

11. Turn on LIMITER and adjust-THRESHOLD ADJ

Control if desired.

ARCHITECTS' AND ENGINEERS' SPECIFICATIONS

The Mixer shall be a self-contained 90- to 132-volt, 50

to 60 Hz, line-operated, all-silicon transistor mixing ampli-

fier with preamplifiers and controls to mix eight independ-

ent low-impedance microphone input signals.

Each input channel in the Mixer shall have independent

HIGH-FREQUENCY and LOW-FREQUENCY controls,

two-

position zero to 15 dB ATTENUATOR Switch and rotary-

motion level control. The 7th and 8th input channels shall

each have an additional input switch to select the de-

sired input level (MIC or LINE).

The PROGRAM OUTPUT circuit shall have a 600-ohm

balanced line level output rated at

+I2 dBm at less than

1% distortion with a minimum clipping level of

+I9 dBm

and a low-impedance, balanced, microphone-level output

at a level 50 dB below the LlNE LEVEL output. A PHASE

switch shall be provided to reverse the phase of both the

LlNE and MICROPHONE LEVEL outputs.

The program channel shall have a rotary motion MAS-

TER LEVEL control, and a 76.2 mm (3 in.) illuminated

VU meter with a 0,

+4,

+8 dBm VU METER RANGE

Switch.

A pair of LlNK Jacks shall be provided in the program

circuit to allow connection to external equipment such as a

compressor, limiter, equalizer, additional mixer or con-

sole, etc.

The Mixer shall have a PHONES level control and a

transformer-coupled headphone (PHONES) output.

The Mixer shall have a voltage gain of 87

%3 dB and a

maximum microphone input sensitivity of 0.1 millivolts for

+4 dBm program output.

The microphone input clipping level, with a zero

attenu-

ator setting, shall be 4.5 millivolts minimum with the level

control at maximum and shall increase to 100 millivolts

minimum with the level control near minimum.

All specifications apply to

SR109-2E

except: operating voltage is

90-132

180-250

volts; no switched

receptacle is provided.

GUARANTEE

This Shure product is guaranteed in normal use to be

free from electrical and mechanical defects for a period

of one year from date of purchase. Please retain proof of

purchase date. This guarantee includes all parts and

labor. This guarantee is in lieu of any and all other guar-

antees or warranties, express or implied, and there shall

be no recovery for any consequential or incidental

damages.

The Mixer shall contain a peak-responding adjustable

output limiter with an in-out switch and an indicator lamp

that flashes when the limiter threshold is exceeded. An

overload lamp, which operates only when the limiter

is not activated, shall indicate when the output clipping

level of the Mixer is exceeded.

An 11-pin accessory monitor output connector shall

provide for connection to one or more Shure

SR110 Pro-

fessional Monitor Mixers to provide separate monitor

mixes for stage monitoring (foldback), multi-channel tape

recording, or stereo broadcasting.

The Mixer shall be enclosed in a metal housing designed

for rack-mounting in a standard 19-inch (483 mm) audio

equipment rack, or mounting in an accessory vinyl-covered

wood portable case.

The Mixer dimensions shall .be 133

mm (5Y4 in.) in

height, 483

mm (19 in.) in width, and 232 mm (9% in.) in

depth. The weight shall be not more than 7.7 kg (17 Ib).

The Mixer shall have a built-in tone oscillator and a level

control built into the channel 1 program circuit. A POWER

on/off switch shall also be located on the front panel. A

switched ac receptacle rated for 500 watts maximum load

shall be provided.

The MICROPHONE INPUT connectors shall be

three- in

female professional audio type. The LlNK Jacks, and tho

PROGRAM LlNE LEVEL OUTPUT Jacks shall be %-inch

phone jacks. One PROGRAM LlNE LEVEL OUTPUT con-

nector and the MIC LEVEL OUTPUT connector shall be

three-pin male professional audio type. The headphone

(PHONES) connector shall be a three-circuit

%-inch phone

jack to be used with either mono or stereo phones with an

impedance of 4 ohms or higher.

Any Mixer not meeting all of the above specifications

shall be deemed unacceptable under this specification.

The Mixer shall be a Shure Model

SR109.

SHIPPING INSTRUCTIONS

Carefully repack the unit and return it prepaid to:

Shure Brothers Incorporated

Attention: Service Department

1501 West Shure Drive

Arlington Heights, Illinois 60004

If outside the United States, return the unit to your dealer

or Authorized Shure Service Center for repair. The unit

will be returned to you prepaid.

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