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222 HARTREY AVE.. EVANSTON. IL. 60204 U.S.A.

MODEL SR107

AREA CODE 312/866.2200 CABLE: SHUREMICRO

AUDIO EQUALIZER

TWX:

910-231-0048 TELEX: 72.4381

OPERATION AND SERVICE MANUAL

The Shure SR107 Audio Equalizer is a compact, versa-

tile unit designed to provide adjustment of tonal balance

on an octave-by-octave basis across the audio frequency

range. The

SR107 is used in sound system applications

for the purposes of feedback control in live performances,

playback equalization (correcting for equipment response

and/or room acoustics in prerecorded performances), and

improvement in the sound quality of live performances.

Equipment response correction includes the elimination

of such problems as transducer incompatibility, overload

at low frequencies (rumble), tape hiss and disc surface

noise. The

SR107 is a balanced input and output line level

device, designed primarily for installation between the

audio console or mixer and the power amplifier of the

sound system.

DESCRIPTION

The SR107 has ten octave band, minimum phase, com-

bining type filters centered on

ISO? preferred frequencies

from 31 Hz to 16 kHz. Each filter is adjustable for ap-

proximately 15 dB of boost or attenuation. The equalized

output is adjustable over a

215 dB range, and overall

gain of up to 20 dB may be introduced to compensate for

low input signals. A peak-responding overload

light-

emitting diode (LED) is provided on the front panel. The

SR107 contains both professional three-pin and phone

jack input and output connectors, and a phone jack

auxiliary output.

The

SR107 is designed for maximum simplicity of op-

eration and maintenance. All components are of the high-

est quality and are operated well within their respective

ratings to assure maximum reliability under normal use

conditions.

The

SR107 and SR107-2E are identical except that the

SR107 operates from 108-132 Vac, 50/60 Hz and the

SR107-2E operates from either 105-125 or 210-250 Vac,

50/60 Hz (switch-selectable). The SR107-2E is supplied

with a detachable ac line cord (without power plug). The

SR107 (only) is listed by Underwriters' Laboratories, Inc.,

and is listed by Canadian Standards Association as

certified.

All

SR107 units are supplied with four rack-mounting

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

equipment racks or in optional Shure

A30A or A105A

Carrying Cases. An optional protective cover, Shure

Model A107A, is also available.

SPECIFICATIONS

Equipment Type

.....

.All transistor inductorless active

equalizer

Voltage Gain:

GAlN Control

at UNITY

.......

dB LINE INPUT to LINE OUT-

PUT

-27

dB LlNE INPUT to AUX

OUTPUT

-50 dB LlNE INPUT to MIC

OUTPUT

GAlN Control

at +20 dB

.......

+20 dB LINE INPUT to LINE

OUTPUT

-7 dB LlNE INPUT

to AUX OUT-

PUT

-30 dB LlNE INPUT

to MIC

OUTPUT

LEVEL Control

...

.Provides additional gain adjust-

ment of k15 dB over values

given above, EQUALIZER IN

mode only.

Frequency Response

.%2 dB from 30 Hz to 20 kHz,

EQUALIZER IN or BYPASS

Signal to Noise Ratio

.....

(20 Hz-20 kHz) .Typically 99 dB at maximum out-

put with Filter Controls and

LEVEL Control at zero and

GAlN Control at UNITY in

EQUALIZER IN mode.

Output Noise,

Maximum

(300 HZ-20

kHz

...

at LINE OUTPUT) -84 dBV (63 pV)

69 dBV (0.50 mV), LEVEL Con-

trol at

+15, Filter Controls at

-91

dBV (28 pV), EQUALIZER

Switch in BYPASS

Output Hum and Noise,

Maximum

(20 HZ-20

kHz

at LINE OUTPUT)

...

83 dBV (71 pV)

67 dBV (0.56 mV), LEVEL Con-

trol at +15, Filter Controls at

-15

-88

dBV (40 pV), EQUALIZER

Switch in BYPASS

lnput Common Mode

Rejection

.........

.90 dB minimum at 100 Hz

Clipping Level

(30 HZ-20

kHz):

Input

............

+18 dBm minimum (+15.8 dBV,

6.2V) GAlN Control at UNITY

-2

dBm minimum (-4.2 dBV,

0.62V) GAlN Control at

20dB

International

Organization

for

Standardization

1979,

Shure

Brothers

Inc.

27Al089

(SF)

'See

Page

Printed

U.S.A.

1 2 3 4 5 6 ... 19 20

Inhaltsverzeichnis

Seite 1 -

222 HARTREY AVE.. EVANSTON. IL. 60204 U.S.A. MODEL SR107 AREA CODE 312/866.2200 CABLE: SHUREMICRO AUDIO EQUALIZER TWX: 910-231-0048 TELEX: 72

Seite 2

Ohmmeter Connections Ohmmeter Readina resistor between the +30 Vdc sup~lv and the orange - ~-~~--~-~ -- ~ - NPN PNP lead (gray lead sti

Seite 3

REPLACEMENT PARTS LIST - Continued * Parts listed as RKC Kits should be ordered by that kit number. Any orders received for piece parts

Seite 4 - BLOCK DIAGRAM

REPLACEMENT PARTS LIST - Continued AMPLIFIER (BOARD Al) Reference Designation EQUALIZER (BOARD A2) Replacement Kit No. * C101, (2103- C104 C102,

Seite 5 - APPLICATIONS

REPLACEMENT PARTS LIST - Continued Parts listed as RKC Kits should be ordered by that kit number. Any orders received for piece parts

Seite 6

NOTES TO CIRCUIT DIAGRAM General Shure part numbers are not shown in the Parts List ac- companying the Circuit Diagram (Figure 11) if parts a

Seite 7

FIGURE 9. 2236-31680-4 AMPLIFIER CIRCUIT BOARD PARTS LOCATION FIGURE 10. EQUALIZER CIRCUIT BOARD PARTS LOCATION

Seite 8 - WARNING

WHT IgO VAL LX)/w HZ 0 WATTS I L KCD ICO IW X3 VDC rf7 FIGURE 11. SR107 AUDIO EQUALIZER CIRCUIT DIAGRAM -- -- - -. POWER 5 I 2 RED h GflN SR107.2E

Seite 9

AMPLIFIER BOARD (A\) I EQUALIZER BOARD (~ai NOTES : I, SPECIFIED. ALL RESISTORS l/4 WATT, 10% UNLESS OTHERWISE rt/ CHASSIS GROUND .$. CIRCUIT BOA

Seite 10 - REPLACEMENT PARTS LIST

Seite 11

The Audio Equalizer shall be a rack-mounted 120-volt, 50/60 Hz line-operated all silicon transistor active audio frequency equalizer for use a

Seite 12 - *'

I 2 34 5 6 FIGURE 1. SR107 FRONT PANEL Output ... +18 dBm minimum (+15.8 dBV, Typical filter frequency re- 6.2V) at LINE OUTPUT spon

Seite 13

Seite 14

EQUALIZER IN/BYPASS Slide Switch - Disables filters and LEVEL Control in BYPASS position and returns gain of Equalizer (LINE INPUT to LlNE OU

Seite 15 - 2236-31680-4

If OVERLOAD Indicator is flashing brightly or on constantly, operating level is too high and will cause distortion, and may result in les

Seite 16 - SR107.2E POWER SUPPLY

The next stage is an input amplifier which has a gain of 14 to 34 dB depending on the setting of the rear panel GAlN Control (12). The outp

Seite 17 - AMPLIFIER

satisfactory sound amplification and coverage. The SR107 Audio Equalizer provides the means for selective sup- pression of those octave fre

Seite 18

Refer to General Operating lnstructions for connec- tions and setup. Use typical program source and program material. Locate listening position i

Seite 19 - SHIPPING INSTRUCTIONS

audience area of a large room will usually result in an overly bright sound. Common practice is to adjust for 3 dB per octave roll

Seite 20

FIGURE 7. SR107 TOP VIEW, COVER REMOVED ing the leads from the push-on board terminals S and R, and removing the four Phillips head screws secu

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Inhaltsverzeichnis

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