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SR109 Professional Mixer
OPERATION AND SERVICE MANUAL
Manufactured by
SHURE BROTHERS INC.
222 Hartrey Avenue
Evanston, Illinois 60204 U.S.A.
WARNING
To reduce the risk o f fire or electric shock, d o not
expose this appliance t o rain o r extreme moisture.
Copyright 1979, Shure Brothers Inc.
27A1413 (SG) Printed in U.S.A.
SR109 Professional Mixer
SPECIFICATIONS
Equipment Type . . . . . . . Allsilicon transistor mixer/pre- Signal to Noise
amplifier (20 Hz-20 kHz) . . . . . .Typically 83 dB at maximum out-
put with one channel Volume
Number of Control and MASTER Volume
lnput Channels ..... . 8 Control set at 8 (approximate-
Power Output . . . . . . . . . +19 dBm (program line level) ly 58 dB gain)
Voltage Gain * lnput Attenuation . . . . . . 0, 15 dB (switch-selected)
Program
- . . . . . . .87 -13 dB MIC input to LlNE lnput Clipping Level
LEVEL out at 1 kHz:
37 -+3 dB LlNE input to LlNE MIC lnput . . . . . . . . 100 mV (ATTENUATOR out; Ch.
LEVEL out Volume at 2)
37 -13 dB MIC input to MIC 4.5 mV (ATTENUATOR out; Ch.
LEVEL out Volume at 12)
Headphones . . . .69 -13 dB MIC input to PHONES 0.56V (ATTENUATOR in; Ch.
out Volume at 2)
Link . . . . .. . . . . .54.5k 3 dB MIC input to LlNK 25 mV (ATTENUATOR in; Ch. Vol-
OUTPUT (with 600-ohm termi- ume at 12)
nation) LlNE lnput . . . . . . . .33V (ATTENUATOR out;
Ch. Vol-
27 k 2 dB LlNK INPUT to LlNE ume at 2)
LEVEL output 1.35V (ATTENUATOR out; Ch.
Accessory . . . . . .59t 3 dB MIC input to ACCES- Volume at 12)
SORY output (via pins 1-8/IN- 90V (ATTENUATOR in; Ch. Vol-
PUTS) ume at 2)
54.5 k 3 dB MIC input to AC- 8.OV (ATTENUATOR in; Ch. Vol-
CESSORY output (via pin ume at 12)
9/PROGRAM) (terminated with
600 ohms) lnput Common
Mode Rejection . . . . . I 0 0 dB at 100 Hz
Frequency Response . . . k 3 dB, 20 Hz-20 kHz (150-ohm
source; 600-ohm load) Low-Frequency
Equalization . . . . . . . . 2 1 3 dB at 100 Hz with respect to
lnput Sensitivity . . . . . . .0.1 mV max. for +4 dBm program 0 (flat) setting
output
High-Frequency
Distortion . . . . . . . . . . . .THDless than 1% at +12 dBm, Equalization . . . . . . . . 2 1 2 dB at 10 kHz with respect
30 Hz-20 kHz; IM distortion less to 0 (flat) setting
than 1% at +12 dBm
Noise Tone Oscillator . . . . .. . . 1 kHz; less than 1% distortion;
(300 Hz-20 kHz) . . . . . - 128 dBV (equivalent input noise variable level
at full gain) lnput Impedance at
-72.8 dBm output noise (MAS- 1 kHz:
TER Volume Control down) Microphone . . . .2.1 kilohms balanced (for use with
25- to 600-ohm microphones)
-38.8 dBm output noise (MAS-
TER and one channel Volume Line (channels 7
Control up) and 8) . . . . . . . . . 66 kilohms balanced bridging
Hum and Noise .
Link lnput . . . . .35 kilohms unbalanced
(20 Hz-20 kHz) . . . . . . - 125 dBV (equivalent input hum
and noise at full gain) Output Impedance:
-61.8 dBm output noise (MAS-
Program . . .. . . .Balanced line level: 120 ohms ac-
tual (for use with 25- to 600-
TER Volume Control down) ohm inputs)
-34.8 dBm output noise (MAS- Microphone level: 0.5 ohms ac-
TER and one channel Volume tual (for use with 25- to 600-
Control up) ohm inputs)
'Measurement conditions: MIC input through 150 ohms, LINE input through 33
kilohms LINK INPUT through 600 ohms PROGRAM LlNE LEVEL terminated in
600 oh&, PROGRAM MIC LEVEL terrhinated in 150 ohms, PHONES termi-
nated in 8 ohms: MASTER Volume, Channel Volume and PHONES Controls
full up; all other controls and switches 0 or out.
SR109 Professional Mixer
SPECIFICATIONS
Headphones ... .3.5 ohms actual (for use with 4- to Phase Switch . . . . . . . . . Output polarity-reversing switch
16-ohm headphones) (0