Rolls RP221 Bottom Feeder User manual
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The RP221 Bottom Feeder is a crossover, subsonic synthesizer, and sonic exciter, designed mainly for the DJ
and karaoke markets. The outputs are not only separate high and low frequencies, but enhanced for crystal
clear highs and lows worthy of Richter scale measurements. You get complete control over the tone of your
sound.
THE ROLLS SONIC EXCITER - SCE PROCESSING
The human ear can detect a frequency range of roughly 20Hz to 20kHz. However, the frequency response
that a normal speaker can effectively reproduce is much, much less. Additionally, speakers add distortion
and phase changes that make the sound quite different from that of the original material.
A sonic exciter restores clarity and presence to the processed signal by correcting phase changes and
harmonic structure differences. In other words, it puts the components of the sound back where they
belong.
All of this magic is done by the use of all-pass filtering, frequency compensated gain adjustment, and
compensated frequency domain delay. What this means to you is the elements of your sound are fanned out
like a deck of cards, making each sound more audible and distinct, reducing the need for high volume and
radical equalizer adjustment.
THE ROLLS SUB-OCTAVE SYNTHESIZER
Specially designed circuitry for the sole purpose of adding ultra low-end to the sound is included in the
RP221. The Sub-Octave Synthesizer divides the low frequency portion of the signal (the frequencies below
the crossover point) in half, providing an extreme bass sound.
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TURESURES
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• Stereo RCA Inputs
• Stereo RCA Loop-through jacks
• Variable Crossover
• ROLLS SCE Processed Sonic Exciter
• ROLLS Sub-octave synthesizer
• Unbalanced RCA Outputs
• External PS27 power supply (included) for low noise operation
SPECIFICATIONS
Frequency Response: 20Hz to 40kHz
Input Impedance: 10KΩunbalanced
THD + Noise: <0.07% typical
Noise Floor: -78 dB
Indicators: Power LED
Clip LED
Crossover Frequencies: Variable from 25 - 140 Hz
Input/Output jacks 4: Stereo RCA jacks
Dimensions:
Weight: 4 lbs.
Power: 12 VDC (Rolls Model PS27)
ROLLS Coporation
5968 South 350 West, Salt Lake City, UT, 84107
(801) 263-9053 FAX (801) 263-9068
INPUT LEVEL
clip
ACTIVE
BOTTOM DEFINITION XOVER FREQ SUB
LEVEL
SUB OCTAVE
SYNTH LEVEL
pwr
RP221
000
- + - +20 25
30
40
55 80 90
100
120
130
140
27
10 10dB Hz 0
0
12 VDC
SUB
OUT
HIGH
OUTPUT
LOOP
THRU INPUT
LEFT
RIGHT
MODEL RP221
MADE IN
USA
SERIAL NUMBER
221-
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