Rolls RPQ160 User manual

RPQ160
Parametric Equalizer
OWNERS MANUAL
ROLLS CORPORATION
SALT LAKE CITY, UTAH
7/00
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.
CLIP
HIGH SHELF
1KHZ
1.5
4
2610
30
16
20
3050 100
LOW SHELF
500
400
200
HZ
0
+12
LEVEL
-12
WIDTH LEVEL
3.3
0
+15
-15
HZ
FREQ
-15
HZ
150 3k
300 800 1.1k
1.8k
ACTIVE
FREQ
70
200 400 600
900
1.5k
100 166
WIDTH
OCT
3.3
OCT
dB dB
+15
FREQ WIDTH LEVEL
0
+15
-15
HZ
FREQ WIDTH LEVEL
0
+15
-15
HZ
PWR
300
800 2.1k 3.3k
7k
10k 600
2k 4k 6k
12k
20k
0
400 900
3.3
OCT
3.3
OCT
d
BdBdB

INTRODUCTION
Thank you for your purchasing the RPQ160 Parametric Equalizer.The RPQ160
usesT filters for equalization circuits to avoid the complexity and distortion of
state-variable filters.The RPQ160 is a four-band parametric equalizer designed
for years of reliable use.Please read this manual carefully to get the best results
from your RPQ160.
WARNING
CAUTION
ATTENTION:
CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT
NOT REMOVE BACK. NO USER SERVICABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
RISQUE DE CHOC - NE PAS ENLEVER
RISK OF ELECTRIC SHOCK
DO NOT OPEN
The symbols shown above are internationally accepted symbols that warn of
potential hazards with electrical products.The lightning flash with arrowpoint in an
equilateral triangle means that there are dangerous voltages present within the
unit.The exclamation point in an equilateral triangle indicates that it is necessary
for the user to refer to the owners manual.
These symbols warn that there are no user serviceable parts inside the unit. Do
not attempt to service the unit yourself.Refer all servicing to qualified personnel.
Opening the chassis for any reason will void the manufacturer’s warranty.Do not
get the unit wet.If liquid is spilled on the unit, shut it off immediately and take it to
a dealer for service.Disconnect the unit during storms to prevent damage.
INSPECTION
1.Unpack and inspect the RPQ160 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 the Warranty Registration Card and return it to the factory.
TABLE OF CONTENTS
Introduction 1
Warnings 1
Inspection 1
Table of Contents 1
Description
Front Panel 2
Rear Panel 2
Connection 2
Operation 3 - 4
Applications 4
Schematic 5
SPECIFICATIONS
CONTROLS MAIN SECTION
Master Level: -12 to +12 dB
Low Shelf: 16 to 00 Hz High-pass filter
High Shelf: 1 to 30 kHz Low-pass filter
Active Switch: Activates/bypasses equalization circuitry
CONTROLS FREQUENCY SECTIONS
Frequency Controls: 70Hz to 1. khz
1 0Hz to 3kHz
300Hz to 10kHz
600Hz to 20kHz
Width: .3 to 3 Octaves each band
Level: -1 to +1 dB each band
Frequency Response: 16 Hz to 30 kHz +/-3 dB
THD: <.03%
S/N Ratio: >90 dB
Max Input: +22 dB
Max Output: +22 dB
Input Impedance: 10KΩ(20K balanced)
Output Impedance: 50Ω
Shelving Slope: 12 dB / Octave
Size: 19" x 6" x 1.75"
(48.3 x 15.2 x 4.5 cm)
Weight: 5 lbs. (2 kg)
16
Specifications 6
Warranty Back Cover

DESCRIPTION
FRONT PANEL
CLIP
HIGH SHELF
1KHZ
1.5
4
2610
30
16
20
3050 100
LOW SHELF
500
400
200
HZ
0
+12
LEVEL
-12
WIDTH LEVEL
3.3
0
+15
-15
HZ
FREQ
+15
-15
HZ
FREQ WIDTH LEVEL
0
+15
-15
HZ
FREQ WIDTH LEVEL
0
+15
-15
HZ
PWR
150 3k
300 800 1.1k
1.8k
300
800 2.1k 3.3k
7k
10k 600
2k 4k 6k
12k
20k
ACTIVE
0
FREQ
70
200 400 600
900
1.5k
100 166 400 900
WIDTH
OCT
3.3
OCT
3.3
OCT
3.3
OCT
dB dB dB dB dB
LOW SHELF:High Pass Filter control;adjusts the amount of low frequency rolloff
from 500 Hz down to 16Hz for the entire output of the RPQ160.
HIGH SHELF:Low Pass Filter control; adjusts the amount of high frequency rolloff
from 1 kHz up to 20 kHz for the entire output of the RPQ160.
NOTE:THERE IS NO BYPASS SWITCH FOR THE LOW OR HIGH SHELF
FILTERS - SIMPLY TURN THE LOW SHELF COMPLETELY COUNTERCLOCK-
WISE, ANDTHE HIGH SHELF COMPLETELY CLOCKWISETO BYPASSTHESE
CIRCUITS.
LEVEL:Adjusts the overall signal level of the RPQ160.
NOTE:The following three descriptions are identical for all four bands of equaliza-
tion.
FREQUENCY: Selects the frequency to be boost or cut.The band frequency
ranges are listed below:
Band 1: 70 Hz to 1.5 kHz
Band2: 150 Hz to 3 kHz
Band 3: 300 Hz to 10 kHz
Band 4: 600 Hz to 20 kHz
WIDTH:(Q):Varies the shape or width of the equalization being boost or cut from
.3 to 3 octaves wide.
LEVEL:Boosts or cuts the signal of the indicated band from -15 to +15 dB.
Power Switch:Applies power to the RPQ160 when the unit is connected to a
properly grounded ac outlet.The Power LED will light when the RPQ160 is on.
REAR PANEL
120 VAC
50/60 Hz 15 VA
MADE IN U.S.A.
CAUTION
RISQUE DE CHOC - NE PAS ENLEVER
RISK OF ELECTRIC SHOCK
DO NOT OPEN
SERIAL NUMBER
WARNING:
DO NOT EXPOSE THIS EQUI PMENT TO RAIN
OR MOISTURE. TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT NOT REMOVE BACK. NO USER SERVICABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
NRTL /C
INPUT
OUTPUT
OUTPUT:Balanced XLR and unbalanced 1/4”and RCA jacks for connection to a
mixing board, power amplifier or recording device.
INPUT:Balanced XLR and unbalanced 1/4”and RCA jacks for connection to the
output of a mixing board, instrument, or other device with the signal to be pro-
cessed.
CONNECTION
Turn off all equipment before making any connections.Mount the RPQ160 in a
properly grounded rack, and make sure the rack is properly ventilated.Ambient
temperatures should not exceed 113 degrees F (45 degrees C) when the equip-
ment is in use.Connect your RPQ160 using XLR, RCA or 1/4”connectors.
Connect the AC power cord to a properly grounded AC outlet.Route the AC
power cord away from audio lines.
SCHEMATIC
2
5
Sheet: 1 of 1
Title: RPQ160 PARAMETRIC EQ Size:
Date: 19-Jul-2000
Rb
P O W E R
+12V
-12V
-12V
+12V
-12V +12V
-12V
H P F
+12V
+12V
-12V
-12V
W I D T H
F R E Q
C U T / B O O S T
W I D T H
F R E Q
W I D T H
F R E Q
W I D T H
F R E Q
B A N D 1
B A N D 2
L O W S H E L F
H I S H E L F
O V E R L O A D
+12V
+12V
+12V
+12V
+12V
-12V
-12V
-12V
-12V
7 0 - 1 . 5 K
1 5 0 - 3 K
300 - 10K
6 5 0 - 2 0 K = F A C T O R Y S E L E C T
R 3
1 0 K 1 %
R 2
1 0 K 1 %
R 1
1 0 K 1 %
C 2 1 2 0 P F
1
E 3
1
E 2
1
E 1
C 5 120P F
12 3
S W 1 A D P D T
R 4
1 0 K 1 %
C 1
120P F
C 3
. 2 7
C 4
. 1
46
5
P 1 B P 1 0 0 K C
1 3
2
P 1 A
P 1 0 0 K C
46
5
P 3 B P 1 0 0 K C
13
2
P 1 0 0 K C
P 2
P 1 0 0 K W
S W S P S T
P L U G A C M A L E
2 31
4
U 1 A
4560
2 31
4
4560
6 57
8
U 2 B
4560
6 57
8
U 1 B
4560
2 31
4
U 3 A
4560
45 6
S W 1 B
D P D T
T 1
M C I 4 0 6 - 4 0 2 4
R 5
1 K
R 6
33K
R 7
3 . 3 K
R 8 10K
R 9
4 . 7 K
R 1 0
4 . 7 K
R 1 1
10K
R 1 2
10K
3 . 3 K
R 1 7 10K
R 1 8 100K
R 1 9 10K
2 K
4 . 7 K
10K
R 2 3
R 2 4
5 1
R 2 6
5 1
100K
R 2 7
5 1
6 57
8
4560
2 31
4
U 4 A
4560
J 1 P H O N E 1 / 4
1
3
J 2 A R C A X 2
2
3
J 2 B
J 4 P H O N E 1 / 4
P 9
P 100K
P 5
P 100K
P 8
P 100K
P 1 1
P 100K
P 1 4
P 100K
2 31
4
U 5 A
4560
6 57
8
U 5 B
4560
2 31
4
U 6 A
4560
6 57
8
U 6 B
4560
2 31
4
U 7 A
4560
6 57
8
4560
R 4 0 10K R 4 1
22K
R 4 2
22K
R 5 0 10K
D 1 L D S G
C 6 120P F
C 7 . 0 0 2 7
C 9
C 1 1
. 0 0 1
C 1 4
10U
C 1 8
10U
R 5 2
22K
C 2 2
10U
C 2 6
10U
C 1 0
10U
1 U
C 3 4 10U
CR1 1N 4148 CR2
1N 4148
C 3 5 503
Q 1
D 2 L D R R
D 3 L D R R
2 31
4
U 8 A
4560
6 57
8
U 8 B
4560
I
1
G
2
O3
U 9 7812
I
2
G1
O3
U 1 0 7912
C 8
. 0 0 1
3 . 3 K
1 2
3
J 3
X L R F P C
6 57
8
U 3 B
4560
P 100K
R 3 0 10K
R 3 2 22K
R 3 1 22K
R 3 5
33K
R 3 6
47K
13
2
P 4 A
P 1 0 0 K X 2
C 1 3 . 4 7
C 1 2
120P F
46
5
P 4 B
P 1 0 0 K X 2
R 4 4
4 . 7 K
13
2
P 1 0 A
P 1 0 0 K X 2
46
5
P 1 0 B
P 1 0 0 K X 2 120P F
R 5 6 47K
R 5 5
33K
P 1 2
P 100K
P 6
P 100K
3 . 3 K
R 5 3 3 . 3 K
13
2
P 1 3 A P 1 0 0 K X 2
46
5
P 1 3 B
P 1 0 0 K X 2 120P F
R 6 6
R 6 5
C 1 5
470P F
C 1 7
. 2 7
C 1 9
220P F
C 2 1
. 1
C 2 5
. 0 4 7
R 6 8
10K
120P F
R 6 2
R 6 0 1 0 K
3 . 3 K
R 6 3
3 . 3 K
R 3 4 4 . 7 K
R 3 3
4 . 7 K
R 4 3 4 . 7 K
13
2
P 7 A
P 1 0 0 K X 2
46
5
P 7 B
P 1 0 0 K X 2
C 1 6
120P F
R 4 6
47K
R 4 5
33K
C 2 8 503
D 4
D 5
D 6
D 7
C 2 9 503
C 3 0 503
R 6 7
R 4 7
R 3 7
R 5 7
R 2 8
R 4 8
R 5 8
R 3 8
1 2
3
J 5
C 3 1
1000U F 16V
C 3 2 1000U F 16V
R e v : A
X L R J A C K M
R C A X 2
10U
10K
C 2 7 503
C 3 3
P L 1
B A N D 4
47K
33K
B A N D 3
R 1 4 10K
ROLLS CORPORATION
5968 South 350 West
Salt Lake City, UT 84107
Document Number: RPQ160SCH
C 2 0
N 4001
R 5 4

OPERATION
The two shelving filters are designed to roll off the frequency response of the
signal;the Low Shelf cuts the frequencies 3 dB at the control’s indicated setting
and rolls off below, and the High Shelf cuts the frequencies 3 dB at the indicated
setting and rolls of above.The Low Shelf Sweep Diagram shows the response
curve of the Low Self filter at its minimum and maximum setting.
20 20k
16k
40 80 160 320 640 12k
Frequency (Hz)
Set at 16Hz
Set at 500 Hz
LOW SHELF SWEEP DIAGRAM
O dB
The High Shelf Sweep Diagram shows the response curve of the High Self filter at
its minimum and maximum setting.
20 40k
20k
40 80 160 320 640 12k
Frequency (Hz)
HIGH SHELF SWEEP DIAGRAM
O dB Set at 30 kHz
Set at 1 kHz
Please note that when the Low Shelf is set fully counterclockwise (16 Hz), the
filter is essentially bypassed.Similarly, when the High Self control is set fully
clockwise (30 kHz), that filter is essentially bypassed.
The Level control has a detente at the center (0 dB) position.if the Clip LED is
lighting, the Level control may be turned counterclockwise to reduce the gain of
the RPQ160, thereby reducing the clipping.If a weak signal is present, the Level
control may be tgurned up (clockwise) to increase the gain.To achieve the
maximum signal to noise ratio, the Level should be set 3 dB below the clipping
level.This is done by adjusting the Level control with a normal signal present until
the Clip LED lights, then turning the Levl down to just below the point when the
LED goes out.
OPERATION Cont.
Shown below is the typical symmetrical response curve of a swept parametric
band filter with the Frequency control set at 1 kHz, the Level set at +15 and -15
dB, and the Octave control set at .3, .5, 1, and 3.These curves remain consistent
over the frequency spectrum, they simply shift to whatever frequency setting is
indicated by the Frequency control.
The shape is most narrow when the OCT control is set at .3, and is widest at the
3 setting.
100 10k 20k
6k
200 600 1k 2k
Frequency (Hz)
-20
-15
-10
- 5
5
10
15
20
50
Amplitude, 5 dB/division
APPLICATIONS
The RPQ160’s precise equalization has many applications including school or
church gymnasiums, home or professional recording studios, live sound, or
musical instruments.
When coupled with a spectrum analyzer, the RPQ160 can match exactly the
properties of typical acoustic resonances and reflections, and make immediate
improvements to any installed system’s amplitude and phase response.
Live applications include equalizing trouble spots where a mix may be muddy, too
harsh, flat, and even eliminate feedback precisely without affecting the flavor of
the overall sound.
Recording studios benefit from the RPQ160’s precise equalization in notching
trouble frequencies that remove from a performances musicality, or by sweetening
up a final mix.
34