d
RPQ160b
Parametric Equilizer
www.rolls.com
Rolls Corporation
Salt Lake City, UT
06/09
LOW SHELF
30
20
MADE IN USA
www.rolls.com
FREQ
VEL
0
300
166
+15
BdBdBdB
WIDTH
800
1.1k
1.8k
3k
150
3.3
HZ
16
ACTIVE
LEVEL
0
-15
+15
OCT
HIGH SHELF
50
4
100
200
2
1.5
400
500
1
HZ
FREQ
2.1k
800
3.3k
400
7k
300
10k
HZ
KHZ
WIDTH
3.3
OCT
LEVEL
0
6
10
30
-12
dB
LEVEL
0
-15
+15
CLIP
+12
2k4k6k
900
600
100
200
FREQ
FREQ
400
600
1.5k
70
HZ
WIDTH
12k
20k
3.3
HZ
900
OCT
WIDTH
3.3
OCT
LEVEL
-15
LEVEL
-15
0
+15
FREQ
0
300
166
+15
dB dB
PARAMETRIC
WIDTH
800
1.1k
1.8k
3k
150
3.3
HZ
OCT
EQUALIZER
RPQ160b
POWER
QUICK START OPERATION GUIDE
-15
LEVEL
0
FREQ
2.1k
800
3.3k
400
7k
300
+15
10k
HZ
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.
SPECIFICATIONS
Ω (20K balanced)
Output Impedance: 50Ω
Shelving Slope: 12 dB / Octave
Size: 19" x 4" x 1.75"
10K
R23
D2
+12V
R20
OVER LOAD
SCHEMATIC
1
Rev:
Vbias
C43
10U
7
J5
XLR JACK M
1 2
J4
PHONE 1/4
3
R25
100K
C10
C9
51
R24
+12V
SW1A
LDRR
123
2K
LDRR
2N3904
D3
Q1
R19
R18
100K
10U
10U
7
4560
8
U4B
6
5
Vbias
10K
R22
+12V
456
R21
4.7K
SW1B
DPDT
DPDT
CR4
1N4148
C6
CR3
1N4148
120PF
R11
Vbias
C5
10K
Vbias
CR1
C2 120PF
3
CR2
1N4148
J3
1N4148
R4
P100KW
P1B
P100KC
LOW SHELF
R5
1K
.27
C3
10K 1%
2
R1
10K 1%
C34
10U
1 2
XLR F PC
J1
PHONE 1/4
2
J2B
RCAX2
3
51
R27
51
R26
1
4560
4
U4A
2
3
R17
10K
1
4560
4
U3A
C8
.001
2
3
R16
3.3K
46
5
C7 .0027
P3B
P100KC
HI SHELF
13
2
P3A
R15
3.3K
P100KC
1
4560
4
U2A
120PF
2
3
10K
R14
R13
100
P6
7
P100K
R12
10K
4560
8
U2B
+12V
10K
6
5
R10
4.7K
Vbias
P2
R9
4.7K
R8
10K
7
46
1
U1A
R2
C35
4560
5
8
U1B
+12V
6
5
R7
2
3.3K
HPF
R6
C4
33K
.1
4560
4
R3
10K 1%
3
Vbias
10K 1%
C1
10U
120PF
1
2
J2A
RCAX2
P1A
CUT/BOOST
P9
P100K
1 3
P100KC
P15
P100K
BAND 3
P12
P100K
Vbias
R28
BAND 1
R30
*
R48
R50
8
+12V
R31
22K
R32
22K
*
10K
4560
8
U3B
+12V
6
5
47U
C36
R108
47K
D1
LDBLU
22K
1N4001
C31
231
J6
120PF
5
FREQ
2
C22
10U
P100K X2
P100K X2
R37
*
R68
DPDT
R56
C20
P10A
70 - 1.5K
C13
10K
R110
C28
D5
1000UF 16V
JAPDC
47K
P10B
.47
47K
503
P100K X2
P100K X2
R57
C32
1N4001
300 - 10K
C21
*
C45503
C44
47UF
R109
47K
C42
BAND 4
R58
503
C41
503
C40
503
+12V
C39
503
7
4560
33K
47K
R66
R65
8
U8B
+12V
6
5
120PF
R61
22K
*
R60 10K
7
4560
8
+12V
6
R41
22K
R42
22K
10K
C24
46
R64
3.3K
5
P13B
P100K X2
C23
650 - 20K * = FACTORY SELECT
FREQ
22K
120PF
R63
3.3K
R62
2
1
C25
.047
13
4560
4
U8A
P13A
P100K X2
2
3
P14
C26
R67
10U
*
P100K
WIDTH
47K
R46
33K
R45
U6B
C16
5
120PF
46
R44
4.7K
5
P7B
150 - 3K
P100K X2
C15
470PF
FREQ
R43
4.7K
2
13
P100K
.27
C17
4
P7A
P100K X2
C18
R47
10U
*
1
4560
U6A
2
3
P8
WIDTH
C33
2200U
2200U
.1
BAND 2
*
R38
R40
R107
47K
+12V
Q2
MPSA06
R111
C27
503
D4
D6
1N4001
123
POWER
SW2A
7
4560
33K
R55
8
U7B
+12V
6
5
R51
22K
46
R54
3.3K
C19
220PF
R53
3.3K
R52
22K
1
13
10K
4560
4
U7A
2
3
P11
P100K
WIDTH
7
R36
47K
33K
4560
R35
U5B
6
5
C12
120PF
46
R34
4.7K
5
P4B
C11
.001
FREQ
R33
4.7K
2
1
13
4560
4
P4A
U5A
2
3
P5
C14
10U
P100K
WIDTH
1
Sheet of
5968 S 350 W
Murray, Utah 84107
RPQ160B.SCH B
ROLLS CORPORATION
2 April 2009
Rb
RPQ160b PARAMETRIC EQUALIZER
Date:
Title
Size: Document Number:
Weight: 4 lbs.
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
D
+
-
DESCRIPTION
DESCRIPTION
REAR PANEL
MADE IN USA
www.rolls.com
ROLLS
PS12
BALLANCED 1/4”
OUTPUTS
SERIAL NUMBER
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
BALLANCED 1/4”
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
INPUTS
BALLANCE
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.
FRONT PANEL
FREQ
2.1k
0
800
400
300
+15
HZ
15
300
166
150
MADE IN USA
www.rolls.com
FREQ
800
1.1k
1.8k
3k
HZ
LOW SHELF
30
20
16
ACTIVE
LEVEL
WIDTH
0
400
-15
3.3
+15
dB dB dB
OCT
HIGH SHELF
HZ
FREQ
2.1k
HZ
4
100
200
2
1.5
400
500
1
WIDTH
3.3k
7k
10k
3.3
OCT
50
800
300
LEVEL
0
6
10
30
-12
+12
KHZ
dB
LEVEL
0
2k4k6k
900
600
-15
+15
CLIP
FREQ
FREQ
400
600
200
100
1.5k
70
HZ
WIDTH
12k
20k
3.3
HZ
OCT
900
-15
WIDTH
3.3
OCT
LEVEL
0
LEVEL
-15
+15
FREQ
0
800
300
166
+15
150
dB dB
HZ
PARAMETRIC
EQUALIZER
1.1k
3k
1.8k
WIDTH
3.3
OCT
LEVEL
-15
RPQ160b
POWER
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.
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.
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.
Set at 16Hz
20
Frequency (Hz)
80
40
LOW SHELF SWEEP DIAGRAM
160
Set at 500 Hz
320
640
12k
16k
O dB
20k
The High Shelf Sweep Diagram shows the response curve of the High Self filter at
its minimum and maximum setting.
O dB
Set at 1 kHz
160
320
20
Frequency (Hz)
80
40
HIGH SHELF SWEEP DIAGRAM
640
Set at 30 kHz
12k
20k
40k
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 shape is most narrow when the OCT control is set at .3, and is widest at the
3 setting.
20
15
10
5
- 5
-10
-15
Amplitude, 5 dB/division
-20
100
50
Frequency (Hz)
200
600
1k
2k
6k
10k 20k
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.
Loading...