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2 2 2 HARTREY AVE.. EVANSTON. IL. 6 0 2 0 4 U.S.A.
AREA CODE 312/866.2200
TWX: 9 1 0 - 2 3 1 - 0 0 4 8
CABLE: SHUREMICRO
TELEX: 72.4381
MODEL SR107
AUDIO EQUALIZER
I
OPERATION AND SERVICE MANUAL
SPECIFICATIONS*
Equipment Type . . . . . .All transistor inductorless active
equalizer
Voltage Gain:
GAlN Control
at UNITY . . . . . . . .O dB LINE INPUT to LINE OUT-
PUT
-27 dB LlNE INPUT to AUX
OUTPUT
-50 dB LlNE INPUT to MIC
The Shure SR107 Audio Equalizer is a compact, versa- OUTPUT
tile unit designed to provide adjustment of tonal balance GAlN Control
on an octave-by-octave basis across the audio frequency at +20 dB . . . . . . . +20 dB LINE INPUT to LINE
range. The SR107 is used in sound system applications OUTPUT
for the purposes of feedback control in live performances, - 7 dB LlNE INPUT to AUX OUT-
playback equalization (correcting for equipment response PUT
and/or room acoustics in prerecorded performances), and -30 dB LlNE INPUT to MIC
improvement in the sound quality of live performances. OUTPUT
Equipment response correction includes the elimination LEVEL Control . . . .Provides additional gain adjust-
of such problems as transducer incompatibility, overload ment of k 1 5 dB over values
at low frequencies (rumble), tape hiss and disc surface given above, EQUALIZER IN
noise. The SR107 is a balanced input and output line level mode only.
device, designed primarily for installation between the
Frequency Response . .%2 dB from 30 Hz to 20 kHz,
audio console or mixer and the power amplifier of the
EQUALIZER IN or BYPASS
sound system.
Signal to Noise Ratio
DESCRIPTION (20 Hz-20 kHz) . . . . . .Typically 99 dB at maximum out-
The SR107 has ten octave band, minimum phase, com- put with Filter Controls and
LEVEL Control at zero and
bining type filters centered on ISO? preferred frequencies
from 31 Hz to 16 kHz. Each filter is adjustable for ap- GAlN Control at UNITY in
proximately 15 dB of boost or attenuation. The equalized EQUALIZER IN mode.
output is adjustable over a 2 1 5 dB range, and overall Output Noise,
gain of up to 20 dB may be introduced to compensate for Maximum
low input signals. A peak-responding overload light- (300 HZ-20 kHz
emitting diode (LED) is provided on the front panel. The at LINE OUTPUT) . . . -84 dBV (63 pV)
SR107 contains both professional three-pin and phone - 69 dBV (0.50 mV), LEVEL Con-
jack input and output connectors, and a phone jack trol at +15, Filter Controls at
auxiliary output. - 15
The SR107 is designed for maximum simplicity of op- -91 dBV (28 pV), EQUALIZER
eration and maintenance. All components are of the high- Switch in BYPASS
est quality and are operated well within their respective Output Hum and Noise,
ratings to assure maximum reliability under normal use Maximum
conditions. (20 HZ-20 kHz
The SR107 and SR107-2E are identical except that the at LINE OUTPUT) . . . - 83 dBV (71 pV)
SR107 operates from 108-132 Vac, 50/60 Hz and the
- 67 dBV (0.56 mV), LEVEL Con-
trol at +15, Filter Controls at
SR107-2E operates from either 105-125 or 210-250 Vac,
-15
50/60 Hz (switch-selectable). The SR107-2E is supplied
-88 dBV (40 pV), EQUALIZER
with a detachable ac line cord (without power plug). The
Switch in BYPASS
SR107 (only) is listed by Underwriters' Laboratories, Inc.,
lnput Common Mode
and is listed by Canadian Standards Association as
Rejection . . . . . . . . . .90 dB minimum at 100 Hz
certified.
Clipping Level
All SR107 units are supplied with four rack-mounting
(30 HZ-20 kHz):
screws for mounting in standard 19-inch (483 mm) audio
Input . . . . . . . . . . . .+18 dBm minimum (+15.8 dBV,
equipment racks or in optional Shure A30A or A105A
6.2V) GAlN Control at UNITY
Carrying Cases. An optional protective cover, Shure
- 2 dBm minimum (-4.2 dBV,
Model A107A, is also available.
+
0.62V) GAlN Control at 20dB
t International Organization for Standardization 'See Page 2
Copyright 1979, Shure Brothers Inc. Printed in U.S.A.
27Al089 (SF)
I 2 3 4 5 6
FIGURE 1 SR107 FRONT PANEL
.
Output ...........+18 dBm minimum (+15.8 dBV, Typical filter frequency re-
6.2V) at LINE OUTPUT sponse characteristics are
-10.2 dBV minimum (0.31V) at shown in Figures 5A and 58.
AUX OUTPUT Filters are minimum phase,
-34.2 dBV minimum (19.5 mV) combining type and electrical-
at MIC OUTPUT ly isolated.
Overload Indicator ....Illuminates 3 dB 21.5 dB before Operating Voltage
output clipping occurs and Power .........SR107: 120 Vac t l o % , 50/60
Input Impedance . . . . . .70 kilohms actual, balanced Hz; 6 watts maximum
bridging (for use with line lev- SR107-2E: 105-125 or 210-250
el source, 10 kilohms or less.) Vac, 50/60 Hz; 6 watts maxi-
Output Impedance: mum
MIC OUTPUT .... .I ohm actual, balanced (for use Accessory Power -31 Vdc open circuit, 27 Vdc at
. . . a
with 25- to 600-ohm inputs) 10 mA, maximum
LINE OUTPUT . . . . I 1 5 ohms actual, balanced (for Temperature
use with 600-ohm lines) Operating ........ -7