CLIP
HIGH SHELF
1
KHZ
1.5
4
2
6
10
30
16
20
30
50
100
LOW SHELF
500
400
200
HZ
0
+12
LEVEL
-12
WIDTH
LEVEL
3.3
0
+15
-15
HZ
FREQ
+15
-15
HZ
FREQ
HZ
150
3k
300
800
1.1k
1.8k
300
800
2.1k
3.3k
7k
10k
ACTIVE
0
FREQ
70
200
400
600
900
1.5k
100
166
400
WIDTH
OCT
3.3
OCT
dB
dB dB
MADE IN USA
www.rolls.com
LEVEL
E
VEL
0
+15
FREQ
+15
-15
HZ
FREQ
WIDTH
LEVEL
0
+15
-15
HZ
FREQ
WIDTH
LEVEL
0
+15
-15
HZ
150
3k
300
800
1.1k
1.8k
300
800
2.1k
3.3k
7k
10k
600
2k
4k
6k
12k
20k
0
166
400
900
WIDTH
3.3
OCT
3.3
OCT
3.3
OCT
d
BdBdBdB
RPQ160b
PARAMETRIC
EQUALIZER
POWER
LEVEL
RPQ160b
Rolls Corporation
Salt Lake City, UT
06/09
www.rolls.com
QUICK START OPERATION GUIDE
Parametric Equilizer
INTRODUCTION
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.
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.
1
ROLLS CORPORATION
5968 S 350 W
Murray, Utah 84107
1
RPQ160B.SCH B
2 April 2009
Title
Size: Document Number:
Date:
Rev:
Sheet of
RPQ160b PARAMETRIC EQUALIZER
Rb
POWER
+12V
+12V
+12V
+12V
HPF
+12V
+12V
WIDTH
FREQ
CUT/BOOST
WIDTH
FREQ
WIDTH
FREQ
WIDTH
FREQ
BAND 1
BAND 3
BAND 2
BAND 4
LOW SHELF
HI SHELF
OVER LOAD
+12V
+12V
+12V
+12V
+12V
70 - 1.5K
150 - 3K
300 - 10K
650 - 20K * = FACTORY SELECT
R3
10K 1%
R2
10K 1%
R1
10K 1%
C2 120PF
C5
120PF
1
2
3
SW1A
DPDT
R4
10K 1%
C1
120PF
C3
.27
C4
.1
46
5
P1B
P100KC
1 3
2
P1A
P100KC
46
5
P3B
P100KC
13
2
P3A
P100KC
P2
P100KW
2
3
1
4
U1A
4560
2
3
1
4
U2A
4560
6
5
7
8
U2B
4560
6
5
7
8
U1B
4560
2
3
1
4
U3A
4560
4
5
6
SW1B
DPDT
R5
1K
R6
33K
R7
3.3K
R8
10K
R9
4.7K
R10
4.7K
R11
10K
R14
10K
R12
10K
R13
100
R15
3.3K
R17
10K
R18
100K
R19
10K
R20
2K
R21
4.7K
R22
10K
R23
10K
R24
51
R26
51
R25
100K
R27
51
6
5
7
8
U4B
4560
2
3
1
4
U4A
4560
J1
PHONE 1/4
1
2
J2A
RCAX2
2
3
J2B
RCAX2
J4
PHONE 1/4
P9
P100K
P5
P100K
P8
P100K
P11
P100K
P14
P100K
2
3
1
4
U5A
4560
6
5
7
8
U5B
4560
2
3
1
4
U6A
4560
6
5
7
8
U6B
4560
2
3
1
4
U7A
4560
6
5
7
8
U7B
4560
R40
10K
R41
22K
R42
22K
R50
10K
R51
22K
D1
LDBLU
C6
120PF
C7 .0027
C9
10U
C11
.001
C14
10U
C18
10U
R52
22K
C22
10U
C26
10U
C10
10U
C33
2200U
C36
47U
CR1
1N4148
CR2
1N4148
CR3
1N4148
CR4
1N4148
C45503
Q1
2N3904
D2
LDRR
D3
LDRR
2
3
1
4
U8A
4560
6
5
7
8
U8B
4560
C8
.001
R16
3.3K
1 2
3
J3
XLR F PC
6
5
7
8
U3B
4560
P15
P100K
R30
10K
R32
22K
R31
22K
R35
33K
R36
47K
13
2
P4A
P100K X2
C13
.47
C12
120PF
46
5
P4B
P100K X2
R44
4.7K
13
2
P10A
P100K X2
46
5
P10B
P100K X2
C20
120PF
R56
47K
R55
33K
P12
P100K
P6
P100K
R54
3.3K
R53
3.3K
13
2
P13A
P100K X2
46
5
P13B
P100K X2
C24
120PF
R66
47K
R65
33K
R61
22K
C15
470PF
C17
.27
C19
220PF
C21
.1
C25
.047
R68
10K
C23
120PF
R62
22K
R60 10K
R64
3.3K
R63
3.3K
R34
4.7K
R33
4.7K
R43
4.7K
13
2
P7A
P100K X2
46
5
P7B
P100K X2
C16
120PF
R46
47K
R45
33K
C27
503
C28
503
D4
1N4001
D5
1N4001
R67
*
R47
*
R37
*
R57
*
R28
*
R48
*
R58
*
R38
*
1 2
3
J5
XLR JACK M
C31
1000UF 16V
C32
2200U
Vbias
Vbias
Vbias
Vbias
Vbias
Vbias
Vbias
C34
10U
C35
10U
2
3
1
J6
JAPDC
R107
47K
R108
47K
R109
47K
R110
47K
1
2
3
SW2A
DPDT
C39
503
C40
503
C41
503
C42
503
C43
10U
+12V
Q2
MPSA06
C44
47UF
R111
22K
D6
1N4001
SPECIFICATIONS
Ω (20K balanced)
Output Impedance: 50Ω
Shelving Slope: 12 dB / Octave
Size: 19" x 4" x 1.75"
Weight: 4 lbs.
SCHEMATIC
FRONT PANEL
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, 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 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
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.
CLIP
HIGH SHELF
1
KHZ
1.5
4
2
6
10
30
16
20
30
50
100
LOW SHELF
500
400
200
HZ
0
+12
LEVEL
-12
WIDTH
LEVEL
3.3
0
+15
-15
HZ
FREQ
+15
-15
HZ
FREQ
HZ
150
3k
300
800
1.1k
1.8k
300
800
2.1k
ACTIVE
0
FREQ
70
200
400
600
900
1.5k
100
166
400
WIDTH
OCT
3.3
OCT
dB
dB dB
MADE IN USA
www.rolls.com
LEVEL
L
+
15
FREQ
+15
-15
HZ
FREQ
WIDTH
LEVEL
0
+15
-15
HZ
FREQ
WIDTH
LEVEL
0
+15
-15
HZ
150
3k
300
800
1.1k
1.8k
300
800
2.1k
3.3k
7k
10k
600
2k
4k
6k
12k
20k
0
166
400
900
WIDTH
3.3
OCT
3.3
OCT
3.3
OCT
dB dB dB
RPQ160b
PARAMETRIC
EQUALIZER
POWER
LEVEL
DESCRIPTION
REAR PANEL
SERIAL NUMBER
WARNING DO NOT EXPOSE THIS
WARNING DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
EQUIPMENT TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF ELECTRIC
TO REDUCE THE RISK OF ELECTRIC
SHOCK DO NOT REMOVE BACK.
SHOCK DO NOT REMOVE BACK.
NO USER SERVICABLE PARTS
NO USER SERVICABLE PARTS
INSIDE. REFER SERVICING TO
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
BALLANCE
D
ROLLS
PS12
MADE IN USA
www.rolls.com
+
-
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.
RISQUE DE CHOC - NE PAS ENLEVER
BALLANCED 1/4”
BALLANCED 1/4”
OUTPUTS
INPUTS
+
-
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.
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 pro-
cessed.
DESCRIPTION
OPERATION OPERATION Cont.
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
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
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.
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 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.
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.
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