RPQ160 Parametric Equalizer
The RPQ160 is a four-band parametric equalizer for the professional audio installation and
music market. The unit is housed in a steel painted 1U rack space chassis, has an internal
power supply, and is designed to withstand the rigors of road use.
Each frequency band has a variable Frequency select control which adjusts the frequency
center, a Width (Q) control which varies the shape of the equalization curve, and a +/- 15 dB
Level control. Additional frequency control has been provided with variable High and Low
pass shelving filters. An overall Level control, a Bypass switch, and a Power LED round out
the front panel.
Since equalization is used on virtually every type of audio signal and in many various applica-
tions, the RPQ160 has RCA, 1/4" and XLR inputs and outputs provided on the rear panel.
A parametric equalizer, unlike conventional graphic equalizers, provides for the precise con-
trol over the frequency selection, band width and levels. The RPQ160 is a powerful tool when
used for room equalization, sound reinforcement, or home or studio recording applications.
FEATURES:
• Four bands of parametric equalization
• +/- 15 dB of Boost/Cut for each frequency
• RCA, 1/4" and XLR inputs and outputs
• Adjustable high and low shelving filters
•
"T" Filters, which avoid the complexity and distortion of state-variable filters
Set at 30 khz
The two shelving filters are designed to tai-
O dB
lor the frequency response of the signal; the
Low Shelf cuts the frequencies 3 dB at the
control's indicated setting and rolls off be-
Set at 1 khz
low, and the High Shelf cuts the frequencies
3dB at the indicated setting and rolls off
20 40 100 320 640 4k 12k 20k 40k
Frequency (Hz)
HIGH SHELF SWEEP DIAGRAM
above.
Set at 16Hz
The Low Shelf Sweep Diagram shows the re-
O dB
sponse curve of the Low Shelf filter at its
minimum and maximum setting.
The High Shelf Sweep Diagram shows the
Set at 500 Hz
IUQDHOC-PASNLVER
10 20 40 80 160 320 640 12k 16k 20k
Frequency (Hz)
response curve of the High Shelf filter at its
minimum and maximum setting.
LOW SHELF SWEEP DIAGRAM
20
Shown to the left is a 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 Oc-
tave control set at .3, .5, 1, and 3. These
curves remain consistent over the frequency
spectrum, they simply shift to whatever fre-
quency setting is indicated by the Frequency
control.
15
10
5
-5
-10
-15
-20
50 100 200
Frequency (Hz)
600 1k 2k
6k 10k 20k
ROLLS Coporation
5143 South Main Street, Salt Lake City, UT, 84107
(801) 263-9053 FAX (801) 263-9068
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