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RPQ160b
Parametric Equilizer
LOW SHELF
50
100
200
30
20
HIGH SHELF
4
6
10
LEVEL
0
200
2
600
100
1.5
MADE IN USA
FREQ
400
WIDTH
16
FREQ
800
HZ 500
166
LEVEL
1.1k
FREQ
800
166
900
KHZ 30
1
CLIP
-12 dB +12
70 HZ 1.5k
3
ACTIVE
300
300
LEVEL
1.1k
WIDTH
0
800
FREQ
2.1k
400
1.8k
WIDTH
0
800
FREQ
2.1k
400
1.8k
3.3k
WIDTH
LEVEL
0
2k
FREQ
4k
900
7k
6k
.3 -15 dB +15
OCT
WIDTH
LEVEL
0
12k
150 HZ
3k
3
.3 -15 dB +15
OCT
300 HZ
PARAMETRIC
EQUALIZER
RPQ160b
dB +15
150 HZ
3k
3
.3 -15 dB +15
OCT
300 HZ
10k
3
.3 -15 dB +15
OCT
600 HZ
20k
3
.3 -15 dB +15
OCT
POWER
www.rolls.com
Rolls Corporation
Salt Lake City, UT
06/09
3.3k
7k
400
www.rolls.com
EVEL
0
LEVEL
0
QUICK START OPERATION GUIDE
10k
2
1
RCAX2
J2A
2
1
3
WIDTH
3
WIDTH
*
R47
C18
10U
P100K
2
R37
R1
R2
3
2
U5A
P4A
U6A
4560
10K
P100K X2
P7A
1
1
2
P4B
C15
2
2
P1A
P100KC
3.3K
R34
4.7K
R44
P7B
150 - 3K
5
6
6
5
6
+12V
Vbias
+12V
U6B
7
R46
47K
R45
33K
4560
R36
47K
R35
33K
4560
+12V
U5B
U1B
7
4560
P100KC
P1B
4
LOW SHELF
120PF C16
R41
22K
BAND 2
4.7K
5
120PF
C12
R31
22K
6
R7
HPF
C4
.1
P100K X2
FREQ
5
70 - 1.5K
P100K X2
470PF
R43
4.7K
R42
22K
R6
33K
BAND 1
.27
R5
1K
1N4148
C3
FREQ 5
R38
*
R33
4.7K
1
C11
.001
R32
22K
R28
*
4560
C17
.27
C13
.47
R40
P100K X2
U1A
R3
10K 1%
4560
R30
10K
Vbias
10K 1%
10K 1%
P8
*
C14
10U
P100K
2
P5
120PF
C1
10U
C35
10U
C34
R4
10K 1%
4
XLR F PC
4
5
8
J1
PHONE 1/4
1
3
3
1
CR1
4
6
8
120PF
7
Vbias 10K
P11
*
*
R67
C26
10U
P100K
WIDTH
R57
C22
10U
P100K
P14
Vbias
WIDTH
10K
R8
R9
4.7K
3
2
10K
R50
5
6
3
2
P100K X2
P13A
1
R63
3.3K
2
C23
22K
C20
120PF
P13B
P100K X2
650 - 20K
R64
3.3K
BAND 4
FREQ 5
120PF
R62
R58
*
P100K X2
300 - 10K
P10B
FREQ 5
R54
3.3K
5
6
P100K
P15
+12V
3
5
6
R56
47K
R55
33K
120PF
C24
R61
22K
U7B
1
4560
CUT/BOOST
4560
U2A
120PF
C6
+12V
R51
22K
R13 3
100
2
R14
10K
CR3
1N4148
2K
R20
BAND 3
C19
220PF
C25
.047
10K
P100K
P9
P100K
P12
R53
3.3K
2
C21
.1
4560
U8A
R60
P100K X2
P10A
1
R52
22K
7
P100K
P6
R12
10K
R48
*
U2B
4560
+12V
R11
10K
C5
120PF
LDRR
D3
Q1
2N3904
OVER LOAD
Vbias
4560
U7A
P100KW
R10
P2
4.7K
CR2
1N4148
100K
4
J3
4
1
3
4
C2
1
3
4
6
8
4
6
8
3
4
+12V
7
U8B
1
R66
47K
R65
33K
4560
P100KC
P3A
R15
3.3K
CR4
1N4148
2
8
1
3
7
6
JAPDC
J6
3
1
R16
DPDT
R21
4.7K
4
U3A
C31
C39
503
C40
503
+12V
1N4001
1000UF 16V
3
1
D6
1N4001
POWER
4560
1
+12V
SW1B 6
DPDT
C8
.001
2
* = FACTORY SELECT
SW2A
2
3
1DPDT
3
2
LDRR
SW1A
D2
3.3K
2
.0027
P100KC
P3B
4
C7
HI SHELF
5
R19
4
6
C27
503
C42
503
C33
2200U
C32
2200U
C28
503
D4
1N4001
C41
503
D5
R17
10K
R22
10K
5
3
2
10K
+12V
Vbias
5
6
R23
U4A
U4B
1
R26
51
51
Q2
MPSA06
R109 C44
47K
47UF
R110
47K
22K
R111
4560
4560
7
R24
10U
C9
47U
C36
5
6
+12V
U3B
4560
RCAX2
J2B
7
5968 S 350 W
Murray, Utah 84107
Rb
Document Number:
RPQ160B.SCH
RPQ160b PARAMETRIC EQUALIZER
Date: 2 April 2009
Size:
3
PHONE 1/4
J4
Rev:
B
Sheet 1 of 1
C43
10U
Vbias
J5
XLR JACK M
ROLLS CORPORATION
503 C45
Title
R108
47K
LDBLU
D1
R68
10K
47K
+12V
R107
R27
51
10U
C10
3
R25
100K
Thank you for your purchasing the RPQ160 Parametric Equalizer. The RPQ160
uses T 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.
8
4
8
4 lbs.
2
Weight:
1
Output Impedance:
Shelving Slope:
Size:
Ω (20K balanced)
50Ω
12 dB / Octave
19" x 4" x 1.75"
2
SPECIFICATIONS
4
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.
8
R18
INTRODUCTION
SCHEMATIC
DESCRIPTION
DESCRIPTION
REAR PANEL
FRONT PANEL
MADE IN USA
www.rolls.com
ROLLS
+
-
PS12
LOW SHELF
50
100
200
30
20
WARNING DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF ELECTRIC
SHOCK DO NOT REMOVE BACK.
NO USER SERVICABLE PARTS
INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
SERIAL NUMBER
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RISQUE DE CHOC - NE PAS ENLEVER
BALLANCED 1/4”
FREQ
400
600
100
16
KHZ 30
HZ 500
1
FREQ
2.1k
WIDTH
CLIP
-12 dB +12
WIDTH
LEVEL
0
300
FREQ
800
166
900
70 HZ 1.5k
ACTIVE
LEVEL
1.1k
WIDTH
0
800
FREQ
2.1k
400
1.8k
3
.3 -15 dB +15
OCT
150 HZ
3k
3
.3 -15 dB +15
OCT
300 HZ
BALLANCED
300
E DE CHOC - NE PAS ENLEVER
200
400
www.rolls.com
FREQ
800
166
OUTPUTS
LEVEL
0
1.5
MADE IN USA
L
NG DO NOT EXPOSE THIS
MENT TO RAIN OR MOISTURE.
DUCE THE RISK OF ELECTRIC
K DO NOT REMOVE BACK.
ER SERVICABLE PARTS
. REFER SERVICING TO
FIED SERVICE PERSONNEL.
HIGH SHELF
4
6
10
2
INPUTS
LEVEL
1.1k
WIDTH
0
800
400
1.8k
3.3k
LEVEL
0
2k
FREQ
4k
900
7k
6k
WIDTH
LEVEL
0
12k
PARAMETRIC
EQUALIZER
RPQ160b
+15
150 HZ
3k
3
.3 -15 dB +15
OCT
300 HZ
10k
3
.3 -15 dB +15
OCT
600 HZ
20k
3
.3 -15 dB +15
OCT
POWER
BALLANCED 1/4”
OUTPUT: Balanced XLR and balanced 1/4” and RCA jacks for connection to a
mixing board, power amplifier or recording device.
INPUT: Balanced XLR and balanced 1/4” and RCA jacks for connection to the
output of a mixing board, instrument, or other device with the signal to be processed.
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 equipment 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.
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 COUNTERCLOCKWISE, AND THE HIGH SHELF COMPLETELY CLOCKWISE TO BYPASS THESE
CIRCUITS.
LEVEL: Adjusts the overall signal level of the RPQ160.
NOTE: The following three descriptions are identical for all four bands of equalization.
FREQUENCY: Selects the frequency to be boost or cut. The band frequency
ranges are listed below:
Band 1:
70 Hz to 1.5 kHz
Band 2:
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.
OPERATION
OPERATION Cont.
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.
O dB
Set at 16Hz
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.
20
Set at 500 Hz
15
10
LOW SHELF SWEEP DIAGRAM
5
The High Shelf Sweep Diagram shows the response curve of the High Self filter at
its minimum and maximum setting.
O dB
Set at 30 kHz
Amplitude, 5 dB/division
20 40 80 160 320 640 12k 16k 20k
Frequency (Hz)
-5
-10
-15
-20
50
100 200
600 1k
Frequency (Hz)
2k
6k 10k 20k
Set at 1 kHz
20 40 80 160 320 640 12k 20k 40k
Frequency (Hz)
HIGH SHELF SWEEP DIAGRAM
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 turned 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 Level down to just below the point when the
LED goes out.
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 out
trouble frequencies that need to be removed, or by re-equalizing a final mix.