Rolls req313 User manual

REQ313
GRAPHIC EQUALIZER
Constant Q
OWNERS MANUAL
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free from
defects in materials and workmanship under normal installation, use and service for a
period of one (1) year from the date of purchase as shown on the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be limited to repair
or replacement (at our option), during the warranty period of any part which proves
defective in material or workmanship under normal installation, use and service, provided
the product is returned to Rolls Corporation, TRANSPORTATION CHARGES PRE-
PAID. Products returned to us or to an authorized Service Center must be accompanied by
a copy of the purchase receipt. In the absence of such purchase receipt, the warranty
period shall be one (1) year from the date of manufacture.
This warranty shall be invalid if the product is damaged as a result of deface-
ment, misuse, abuse, neglect, accident, destruction or alteration of the serial number,
improper electrical voltages or currents, repair, alteration or maintenance by any person or
party other than our own service facility or an authorized Service Center, or any use
violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations or
liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILITIES,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, SHALL BE
LIMITED IN DURATION TO THE ONE YEAR DURATION OF THIS WRITTEN
LIMITED WARRANTY. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCIDENTAL
OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER
WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow
the exclusion or limitation of special, incidental or consequential damages so the above
limitation or exclusion may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
ROLLS CORPORATION
SALT LAKE CITY, UTAH
4/01
CONSTANT Q
REQ313
31 BAND
GRAPHIC
EQUALIZER

INTRODUCTION
The ROLLS REQ313 graphic equalizer is intended for room equalizing or sound
shaping and the approximate frequency response curve can be seen graphically
by the settings of the frequency controls.Recording and broadcasting studios,
sound contractors and musicians will appreciate the low noise, straightforward
design, and versatile signal control of the REQ series.
INSPECTION
1.Unpack and inspect the REQ313 box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a
damage claim.We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2.Please complete theWarranty Registration Card and return it to the factory.
TABLE OF CONTENTS
1. Introduction
Inspection
Table of Contents
2. Description
Front Panel
Rear Panel
3. Operation, Installation
4. Example diagram
5. Schematic
6. Specifications
Back Cover: Warranty
SPECIFICATIONS
Equalizer
Bands: 31
Frequency Response: 20Hz - 20kHz
Accuracy: 5% Center Frequency
Range: +6dB or +12 dB (Switch selectable)
Inputs Type: Active Balanced/Unbalanced
Connectors: XLR, 1/4” TRS
Impedance: 12k Ohms
Maximum Level +22 dB (Balanced), +15dB (Unbalanced)
Outputs Type: Electronically Balanced
Connectors: XLR, 1/4” TRS
Impedance: 600 Ohms
Maximum Level: +22 dB (Balanced), +15dB (Unbalanced)
RFI Filters: Yes
Passive Bypass Switches: Yes
Overload LED Threshold: 3dB below clipping
Low Cut Filter: 10 - 250Hz, 12dB/Oct.
Frequency Response: 20Hz - 20kHz, +0.5dB
THD + Noise: 0.01% (20Hz - 40kHz)
S/N Ratio: 110dB below Max level (A weighted)
Equivalent Input Noise: -95dB (20kHz noise bandwidth)
Dimensions: 3.5”H x 19”W x 8.5”D
1 6

DESCRIPTION
FRONT PANEL
Power Switch:To turn the REQ313 on or off, press the upper or
lower portion of this button.
NOTE: ALWAYS TURN THE EQUALIZER ON BEFORE THE
POWER AMPLIFIER IS TURNED ON, AND TURN THE EQUAL-
IZER OFF AFTER THE POWER AMPLIFER IS TURNED OFF.
Filter Level Controls; Each of these sliders control the output level
of each of the 31 bandpass filters. Center detent position is
grounded for guaranteed flat response.
Filter Range Switch & Indicators:The gain range of the filter sliders
is switchable (as a group) from +/-6dB to +/-12dB. At 6dB the
green LED will light, at 12dB the yellow LED will light.
Bypass Switch & Indicator:When the red LED is lit, the equalizer
circuitry is bypassed.Use this switch to compare equalized and
unequalized material, or to bypass the EQ in the event of power
loss.
Overload Indicator:This LED lights if any section of the EQ circuitry
is within 3dB of clipping. Occasional blinking of this LED is accept-
able.
Low-Cut Frequency Control:This control determines the roll-off
frequency of the High-Pass Filter.This roll-off frequency can be
adjusted from 10Hz to 250Hz.
High-Cut Frequency Control:This control determines the roll-off
frequency of the Low-Pass Filer.This roll-off frequency can be
adjusted from 3kHz to 40kHz.
REAR PANEL
The rear panel contains the XLR and 1/4” input and output jacks.
Connect the power cable to a properly grounded AC outlet.
Fuse Holder: This receptacle contains an AC primary fuse. Always
replace this fuse with the same type and rating of fuse.If the fuse is
blowing out consistantly after each replacement, the unit is in need
of service.
SCHEMATIC
5 2

OPERATION AND APPLICATIONS
The REQ equalizers are useful signal processing tools where
precise frequency control is needed across the audio spectrum.
When used with an analyzer,the REQ units may be used to tune an
acoustical environment to avoid ringing (feedback), increase clarity,
and flatten the overall frequency response. Insert the graphic equal-
izer between the signal source and the power amplifier or cross-
over.Adjust the level and equalization as required to yield the
desired system response.The Low Cut and High Cut filters are
used to band-limit the frequency response to increase clarity and
reduce noise.
The equalization filters in the REQ313 are constant bandwidth
(constant Q).The bandwidth of each individual filter is guaranteed
to be narrow enough to prevent unwarranted interaction between
filters, yet wide enough to produce exactly the type of correction
curve demanded by even the most unusual acoustic surroundings.
INSTALLATION
Your REQ313 may be installed in a standard 19” rack or placed in
any dry, well ventilated area.The 1/4” connectors are balanced with
the tip being positive (+) and the ring negative (-), or will assume an
unbalanced state with unbalanced (TS) connectors.The XLR con-
nectors are pin 2 positive (+).
EXAMPLE
AUX 2
RETURN
0 10
AUX 1
RETURN/
TAPE IN LEVEL
0 10
HEADPHONE LEVEL
0 10
LEFT RIGHT
0
+20
+6
+14
-10 -15
-20
-30
-
+17
+8
0
-4
-13
HEADPHONE
OUTPUT
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
BAL
11/12
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
BAL
9/10
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
BAL
7/8
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10 AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
BAL
5/6
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
PAN
4
0
+20
+6
+14
-10
-15 -20 -30
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
PAN
3
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
PAN
1
0
+20
+6
+14
-10
-15 -20 -30
AUX 1
0 10
AUX 2
0 10
60
LOW
-15 +15
2.5 K
MID
-15 +15
12.5 k
HIGH
-15 +15
L R
PAN
2
0
+20
+6
+14
-10
-15 -20 -30
-
-
-
-
-
-
-
-
TAPE
OUT TAPE
IN
R
L
TRIM
LINE
INSERT
MIC 1
INSERTINSERT
INSERT
LINELINELINE
TRIM
TRIMTRIMTRIMTRIM
TRIMTRIM
PHANTOM POWER LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
RIGHT OUT AUX 2
RET. LEFT
LEFT OUT AUX 2
RET. RIGHT
AUX 1
RET. RIGHT
AUX 1
RET. LEFT
AUX 1
OUT
AUX 2
OUT
MIC 2
MIC 3MIC 4MIC 5/6MIC 7/8MIC 9/10MIC 11/12
+48V
OFF
+10
+60
+10
+60
+10
+60
+10
+60
+10
+60
+10
+60
+10
+60
+10
+60
CORPORATION
CORPORATION
MODEL REQ313
MODEL REQ313
WARNING:
WARNING:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE BACK.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE BACK.
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
QUALIFIED SERVICE PERSONNEL.
RISQUE DE CHOC - NE PAS ENLEVER
RISQUE DE CHOC - NE PAS ENLEVER
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
VOLUME 2
P
OWER
A
MPLIFIER RA200
43