Rolls Rpq160b Parametric Equalizer Installation Guide (+ PDF)

Inspect the RPQ160 box and package upon unpacking. If there is
any physical damage, contact the carrier immediately.
Save the shipping carton and packing materials for future
transportation.
Turn off all equipment before making any connections.
Mount the RPQ160 in a properly grounded rack with proper
ventilation.
Ambient temperatures should not exceed 113 degrees F (45
degrees C) during use.
Connect the RPQ160 using XLR, RCA, or 1/4 connectors.
Connect the AC power to a properly grounded outlet and route
the power cord away from audio lines.

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Rolls Corporation Salt Lake City, UT
05/22

RPQ160b
Parametric Equilizer

www.rolls.com

LOW SHELF HIGH SHELF

50 30 20

100

200 2

1.5

6 10

400

16 HZ 500 ACTIVE

1 KHZ 30

LEVEL 0

FREQ

400

WIDTH

200

600

100

900

LEVEL 0

FREQ

800

WIDTH

300

1.1k

166

1.8k

LEVEL 0

FREQ

2.1k

800

3.3k

400

CLIP -12 dB +12

70 HZ 1.5k 3 .3 -15 dB +15 OCT

150 HZ 3k 3 .3 -15 dB +15 OCT

300 HZ 10k 3

EVEL 0

FREQ

800

WIDTH

300

1.1k

166

1.8k

LEVEL 0

FREQ

2.1k

WIDTH

800

3.3k

400

LEVEL 0

FREQ

WIDTH

900

12k

LEVEL 0

dB +15 150 HZ 3k 3 .3 -15 dB +15 300 HZ 10k 3 .3 -15 dB +15 600 HZ 20k 3 .3 -15 dB +15

OCT

PARAMETRIC EQUALIZER
RPQ160b
POWER

QUICK START OPERATION GUIDE

SPECIFICAT IONS
Thank you for your purchasing the RPQ160 Parametric Equaliz er. 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 car rier immediately to make a damage claim. We suggest s aving the shipping car ton and pac king materials for safely transporting the unit in the future.

OutputI mpedance: Shelving Slope: Size:
Weight:

(20K balanced) 50 12 dB / Octave 19″ x 4″ x 1.75″
4 lbs.

DESCRIPTION REAR PANEL

FRONT PANE L

DESCRIPTION

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ROLLS +
–

SERIAL NUMBER
CAUTION
RISK OF ELECTRIC SHOCK DO NOT OPEN

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″

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LOW SHELF HIGH SHELF

50 30 20

100

200 2

1.5

6 10

400

16 HZ 500 ACTIVE

1 KHZ 30

LEVEL 0

FREQ

400

WIDTH

200

600

100

900

LEVEL 0

FREQ

800

WIDTH

300

1.1k

166

1.8k

LEVEL 0

FREQ

2.1k

800

3.3

400

CLIP -12 dB +12

70 HZ 1.5k 3 .3 -15 dB +15 OCT

150 HZ 3k 3 .3 -15 dB +15 OCT

300 HZ 10

OUTPUTS

INPUTS

FREQ

LEVEL

FREQ

LEVEL

FREQ

LEVEL

800

WIDTH

2.1k

WIDTH

300

1.1k

800

3.3k

166

1.8k

400

900

12k

+15 150 HZ 3k 3 .3 -15 dB +15 300 HZ 10k 3 .3 -15 dB +15 600 HZ 20k 3 .3 -15 dB +15

OCT

PARAMETRIC EQUALIZER
RPQ160b
POWER

BALLANCED 1/4″

OUTPU T: Balanced X LR and balanced 1/4″ and RCA jac ks for connection to a mixing board, power a mplifier or recording device. INPU T: Balanced X LR and balanced 1/4″ and RCA jac ks for connection to the output of a mixing board, instrument, or other device with the s ignal to be processed.
CONNECTION Tu rn off all equipment before making any connections . Mount the RPQ160 in a properly grounded rac k, 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 X LR, RCA or 1/4″ connector s. Connect the AC power to a properly grounded AC outlet. Route the AC power cord away from audio lines .

LO W SHELF: H igh Pass F ilter control; adjusts the amount of low frequency rolloff from 500 H z down to 16Hz for the entire output of the RPQ160. HIGH SHELF: L ow P ass F ilter control; adjusts the amount of high frequency rolloff from 1 kHz up to 20 kHz for the entire output of the RPQ160. NO TE : T HERE IS NO B YP ASS S WITCH FOR THE LO W OR H IGH SHEL F FI LT ERS – S IMPL Y TURN T HE LOW SHELF COMPLETELY COUNTERCLOCKWISE, AND THE HIGH S HELF COMPLETELY CLOCKWISE TO B YPASS THESE CIRCUITS . LEVEL : Adjusts the overall signal level of the RPQ160.

NO TE : The following three desc riptions a re identical for a ll four bands of equaliza-

tion.

FREQ UENC Y: S elects the frequency to be boost or cut. The band frequency

ranges a re listed below:

Band 1:

7 0 Hz to 1.5 kHz

Band 2:

1 50 Hz to 3 kH z

Band 3:

300 Hz to 10 kH z

Band 4:

600 Hz to 20 kH z

WIDTH: (Q) : Va ries 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.

Po wer Switch: Applies power to the RPQ160 when the unit is connected to a

properly grounded a c outlet. The P ower L ED will light when the RPQ160 is on.

OPERAT ION
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 H igh Shelf cuts the frequencies 3 dB at the indicated setting and rolls of above. The L ow Shelf Sweep Diagram shows the response curve of the L ow Self filter a t its minimum and maximum setting.

Set at 16Hz

O dB

Set at 500 Hz
20 40 80 160 320 640 12k 16k 20k Frequency (Hz)
LOW SHELF SWEEP DIAGRAM

OPERAT ION Cont .
Shown below is the typical symmetr ical response curve of a swept parametric band filter with the Fr equency control set a t 1 kHz, the L evel set a t +15 and -15 dB, and the O ctave control set a t .3, .5, 1, and 3. These c urves 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 a t .3, and is widest at the 3 setting.
20 15 10
5

Amplitude, 5 dB/division

The High Shelf Sweep Diagram shows the response curve of the High Self filter a t its minimum and maximum setting.

O dB

Set at 30 kHz

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 H igh 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 L evel 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 achi eve the maximum s ignal 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 s ignal present until the Clip L ED lights, then turning the L evel down to just below the point when the LED goes out.

– 5

-10

-15

-20

50 100 200

600 1k 2k

Frequency (Hz)

6k 10k 20k

APPLIC AT IONS The RPQ160’s precise equalization has many applications including school or church gymnasiums, home or professional recording s tudios , live sound, or musical instruments.
When coupled with a spect rum analyz er, 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 withoutaffecting 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.