Shure SR106 Operation And Service Manual

2 2 2 HARTREY AVE.. EVANSTON, IL. 6 0 2 0 4 u.S.A.
MODEL SR106
AND SR106-2E
AREA CODE 3 1 2 / 8 6 6 - 2 2 0 0
.
CABLE: SHUREMICRO
TWX: 9 1 0 - 2 3 1 - 0 0 4 8 T E L E X 7 2 - 4 3 8 1
1
DATA
I
SHEET
ELECTRONIC CROSSOVERS
OPERATION AND
The Shure Model SR106 Electronic Crossover is a
selectable-frequency dividing network, designed for
use with two- or three-way speaker systems such as
the Shure SR108 Extended Range Speaker System in
high-quality sound systems. It utilizes the principle
of biamplification to separate an audio console or
mixer-preamplifier output into two frequency bands for
distribution to separate power amplifiers. In this man-
ner, the advantages of low distortion, increased high-
frequency power, wide dynamic range, and maximum
efficiency are obtained.
DESCRIPTION
The SR106 provides crossover frequencies of 500
Hz, 800 Hz and 2600 Hz. It can be used to provide two
output frequency bands or, in conjunction with a
second SR106, to provide three output frequency
bands, with each output routed to a separate power
amplifier (triamplification). The SR106 contains both
professional three-pin and phone jack input and out-
put connectors, and can be operated in line level bal-
anced and unbalanced systems.
The SR106 is designed for maximum simplicity of
operation and maintenance. A frequency-selector
switch and a power on-off switch are the only con-
trols. Silicon transistors and other solid-state devices
are used throughout. All components are of the high-
est quality and are operated well within their re-
spective ratings to assure maximum reliability under
normal use conditions.
The SR106 and SR106-2E are identical except that
the SR106 operates from 108-132 Vac, and the
SR106-2E operates from either 105-125 or 210-250 Vac
(switch-selectable).
All SR106 Series units are supplied with four rack-
mounting screws for mounting in 483 mm (standard 19
in.) audio equipment racks or in optional Shure A30A
or A105A Carrying Cases. In addition, the SR106 is
supplied with a protective power switch cover and the
SR106-2E is supplied with an ac line cord (without
power plug). The SR106 (only) is listed by Under-
writers' Laboratories, Inc., and is listed by Canadian
Standards Association as certified.
SPECIFICATIONS
Type
............................
All silicon transistor electronic
crossover network
Crossover
Frequency .............. 500 Hz, 800 Hz or 2600 Hz
(selectable)
SERVICE MANUAL
Voltage Gain
..............
0 2 1 dB (low or high frequency
output) with 47-kilohm output
termination
-
1.5
+
1 dB with 600-ohm
output termination
Input Sensitivity ........ 1-volt input produces I-volt
output (unity gain) with
47-kilohm output termination
I-volt input produces 0.84-volt
output with 600-ohm output
termination
Frequency
Response
................
Electrical sum of outputs (phase
reversed): flat t 2 dB,
20-20,000 HZ
High-frequency output: 12 dB/
octave rolloff below crossover
Low-frequency output: 6 dB/
octave rolloff above crossover
(see Figure E)
Phase
........................
..Input and low frequency output
connectors in phase, high
frequency output reversed
phase
lnput Common
Mode Rejection
......
92 dB minimum at 100 Hz
Input Impedance ........ 47 kilohms
Total Harmonic
Distortion
................
1 % max. (I-volt input; low
frequency: 20-2,600 Hz; high
frequency: 500-20,000 Hz)
Hum and Noise
..........
-
96 dBV max. low or high
frequency output (through
20,000 Hz noise-bandwidth
filter with 20 Hz lower cut-off;
600-ohm source, 47-kilohm
output terminations)
.......................
Noise . . .
-
98 dBV max. low or high
frequency output (through
20,000 Hz noise-bandwidth
filter with 300 Hz lower cut-off;
600-ohm source, 47-kilohm
output terminations)
Clipping Level
............
+
18 dBm (6.2V) min. input from
30-20,000 Hz with 600-ohm or
greater output loads.
Recommended Output
Load Impedance
....
600 ohms minimum
(115 ohms actual output im-
pedance)
Power Supply
............
SR106: 120 volts t l o % , 50/60
Hz ac only. SR106-2E: 105-125
or 210-250 volts, 50/60 Hz ac
only. Power consumption:
3 watts maximum.
Copyright 1979, Shure Brothers Inc.
27A1145
(SF)
Printed in U.5.A