ROLLS RPQ160b Parametric Equalizer Installation Guide

RPQ160b
Parametric Equalizer

QUICK START OPERATION GUIDE

RPQ160b Parametric Equalizer

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 car rier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future.

SPECIFICATIONS

CONTROLS MAIN SECTION

Master Level: -12 to +12 dB
Low Shelf: 16 to 500 Hz High-pass filter
High Shelfi 1 to 30 kHz Low-pass filter
Active Switch: Activates/bypasses equalization circuitry
CONTROLS FREQUENCY SECTIONS
Frequency Controls: 7011z to 1.5khz 150Hz to 3kHz 300Hz to 10kHz 600Hz to 20kHz
Width: .3 to 3 Octaves each band
Level: -15 to +15 dB each band

DESCRIPTION

REAR PANEL

OUTPUT: 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 .

FRONT PANEL

LOW SHELF: High Pass F liter 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 – S IMPLY 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 a re identical for all four bands of equalization.
FREQ  UENCY : Selects the frequency to be boost or cut. The band frequency ranges a re listed below:

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.
Power 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.

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 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 Low Self filter a t its minimum and maximum setting.

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

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.
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 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 a t .3, and is widest at the 3 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 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.

www.rolls.com
Rolls Corporation
Salt Lake City, UT
05/22

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