Parametric Equilizer RPQ160b - Blender ROLLS - Free user manual and instructions

Product Type	Parametric Equalizer
Model	RPQ160b
Brand	Rolls
Dimensions	19" x 4" x 1.75" (rack mountable)
Weight	4 lbs
Power Supply	AC powered (standard IEC cord)
Frequency Response	16 Hz – 30 kHz ±3 dB
Total Harmonic Distortion	< 0.03%
Signal-to-Noise Ratio	> 90 dB
Maximum Input Level	+22 dB
Maximum Output Level	+22 dB
Input Impedance	10 kΩ (20 kΩ balanced)
Output Impedance	50 Ω
Shelving Slope	12 dB/octave
Number of EQ Bands	4 fully parametric bands
Band Frequency Ranges	Band 1: 70 Hz – 1.5 kHz Band 2: 150 Hz – 3 kHz Band 3: 300 Hz – 10 kHz Band 4: 600 Hz – 20 kHz
Bandwidth (Q) Control	0.3 to 3 octaves per band
Band Level Control	–15 dB to +15 dB per band
Master Level Control	–12 dB to +12 dB with center detent
Low Shelf Filter	16 Hz – 500 Hz (high-pass)
High Shelf Filter	1 kHz – 30 kHz (low-pass)
EQ Bypass	Active switch bypasses all EQ; shelf filters bypassed at extreme settings
Input Connectors	Balanced XLR, balanced 1/4", RCA
Output Connectors	Balanced XLR, balanced 1/4", RCA
Indicators	Power LED, Clip LED
Applications	Studio, live sound, feedback elimination, instrument EQ
Maintenance	Clean with dry cloth; do not use liquids or solvents

Frequently Asked Questions - Parametric Equilizer RPQ160b ROLLS

How do I bypass the shelving filters?

There is no dedicated bypass switch for the Low or High Shelf filters. To bypass the Low Shelf, turn the control fully counterclockwise (16 Hz). To bypass the High Shelf, turn the control fully clockwise (30 kHz).

What are the frequency ranges of the four parametric bands?

Band 1: 70 Hz – 1.5 kHz
Band 2: 150 Hz – 3 kHz
Band 3: 300 Hz – 10 kHz
Band 4: 600 Hz – 20 kHz.

How do I connect the RPQ160 to my system?

Turn off all equipment. Use balanced XLR, balanced 1/4" TRS, or RCA cables. Connect the INPUT jacks to your signal source and the OUTPUT jacks to your mixer, recorder, or amplifier. Ensure proper grounding and ventilation.

What does the Clip LED indicate?

The Clip LED lights when the input signal is too high. Reduce the Master Level control until the LED goes out. For optimal signal-to-noise ratio, set the level 3 dB below the clipping point.

How can I eliminate feedback with the RPQ160?

Use the parametric bands to notch out the feedback frequency. Set a narrow bandwidth (low Q) and cut the offending frequency using the Level control. Adjust Frequency and Width until feedback stops.

What is the function of the Active switch?

The Active switch activates or bypasses the entire equalization circuitry. When bypassed, the signal passes through without EQ. The switch does not affect the shelving filters.

What are the typical applications for the RPQ160?

The RPQ160 is used in recording studios, live sound systems, houses of worship, and for musical instruments. It can correct room acoustics, notch out resonances, and shape tone precisely.

How do I clean and maintain the unit?

Use a dry, soft cloth to clean the front panel and chassis. Do not use liquids, solvents, or abrasive cleaners. Keep the unit in a well-ventilated area away from excessive heat and moisture.

What is the power requirement for the RPQ160?

The RPQ160 uses a standard IEC AC power cord. It operates on standard mains voltage (110-120V or 220-240V depending on region; check the unit label). Always connect to a properly grounded outlet.

Can I use the RPQ160 with a balanced or unbalanced signal?

Yes, the RPQ160 accepts both balanced and unbalanced signals. Use balanced XLR or 1/4" TRS for balanced, or RCA for unbalanced. The input impedance is 10 kΩ unbalanced and 20 kΩ balanced.

USER MANUAL Parametric Equilizer RPQ160b ROLLS

Salt Lake City, UT 06/09

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

CONTROLS MAIN SECTION

Master Level:	-12 to +12 dB
Low Shelf:	16 to 500 Hz High-pass filter
High Shelf:	1 to 30 kHz Low-pass filter
Active Switch:	Activates/bypasses equalization circuitry

CONTROLS FREQUENCY SECTIONS

Frequency Controls:	70Hz 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

Frequency Response:

16 Hz to 30 kHz +/-3 dB

THD:

<.03%

S/N Ratio:

>90 dB

Max Input:

+22 dB

Max Output:

+22 dB

Input Impedance:

10KΩ (20K balanced)

Output Impedance: 50Ω

Shelving Slope:

12 dB / Octave

Size:

19" x 4" x 1.75"

Weight: 4 lbs.

REAR PANEL

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.

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 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.

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.

LOW SHELF SWEEP DIAGRAM

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

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.

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.

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