Rolls RFX147 User Manual
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be
free from defects in materials and workmanship under normal installation,
use and service for a period of one (1) year from the date of purchase as
shown on the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be
limited to repair or replacement (at our option), during the warranty period
of any part which proves defective in material or workmanship under
normal installation, use and service, provided the product is returned to
Rolls Corporation, TRANSPOR TATION CHARGES PREPAID. Products
returned to us or to an authorized Service Center must be accompanied by
a copy of the purchase receipt. In the absence of such purchase receipt, the
warranty period shall be one (1) year from the date of manufacture.
This warranty shall be invalid if the product is damaged as a result
of defacement, misuse, abuse, neglect, accident, destruction or alteration
of the serial number, improper electrical voltages or currents, repair,
alteration or maintenance by any person or party other than our own
service facility or an authorized Service Center, or any use violative of
instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties,
obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILITIES, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, SHALL BE LIMITED IN DURATION
TO THE ONE YEAR DURATION OF THIS WRITTEN LIMITED
WARRANTY. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not apply to you.
RFX147
ROTORHORN
Rotating Speaker Simulator
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF
THIS OR ANY OTHER WARRANTY, EXPRESSED OR IMPLIED,
WHATSOEVER. Some states do not allow the exclusion or limitation of
special, incidental or consequential damages so the above limitation or
exclusion may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
RFX
Salt Lake City, UT
8/01
OWNERS MANUAL
INTRODUCTION
SPECIFICATIONS
Thank you for y our purchase of the RFX147 Rotorhorn. This unit is a line level
rack mount signal processor for duplicating the sound of a rotating horn speaker
cabinet electronically. It has a two-wa y crosso v er network to produce the eff ect of
bass and treble "rotors". The unit is housed in a single space 19" rac k painted
steel chassis and is intended for live perf ormance or studio work. The RFX147 is
simple to use and is ready to work on power up.
FEATURES
• Accurate simulation of "Leslie" fast and slo w speeds
• Front panel and f oots witch control of all functions
• Smooth sounding CHORUS eff ect
• Mono VIBRATO effect
INSPECTON
1. Unpac k and Inspect the RFX147 pac kage
If obvious physical damage is noticed, contact the carrier immediately to make a
damage claim. We suggest sa ving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please complete the Warr anty Registration Card and return it to the factory.
TABLE OF CONTENTS 1
Introduction
Features
Inspection
Table of Contents
DESCRIPTION 2
Front P anel
Rear Panel
CONNECTION 3
Input: Dual 1/4" unbalanced
Output: Dual 1/4" unbalanced
Input Impedance: 50k Ohms
Output Impedance: 100 Ohms
Output Lev el: +5 dB max
Delay Time: 6 mS
Crossover Freq. 800 Hz
Size: 19 x 1.75 x 6 inches
Weight: 7 lbs
BRIEF HISTOR Y OF THE ROTATING SPEAKER
Electronic devices that produce a “Leslie-lik e” sound ha v e been a v ailable since
the sixties. Cheap solid state components and the need f or more portable equipment led to the development of numerous “electronic Leslies” and tremolo-vibrato
add-on devices. Fe w early Leslie simulators were authentic enough to f ool e ven
causal listeners and rarely sounded like a real Leslie Speaker. Most relied on
simple phase-shift circuitry and their primary advantages were compactness and
low cost. Current equipment is much impro v ed and it’s often difficult to tell the
difference between a real Leslie and a simulator, especially on recordings.
All mechanical rotary tremolo systems are based on the Doppler-effect. Disco vered by Austrian mathematician and ph ysicist Christian Doppler (1803-1853) in
the early nineteenth century, the Doppler-eff ect is the apparent variation in pitch
that a stationary listener hears from a moving sound source. In practice , the
loudness of the sound also appears to vary and it is this combination of frequency
(vibrato) and ampli-tude (tremolo) modulation that give rotating speaker and other
Doppler-effect systems their characteristic sound.
OPERATION 4
SCHEMATIC 5
SPECIFICATIONS 6
A brief history of the rotating speaker effect
WARRANTY BACK COVER
Basic Doppler characteristics are easily created electronically . However , most
simulators don’t reflect sound or produce the unique audio characteristics of
mechanical systems. Rotating speak er elements also direct sound out the sides
and back of the cabinet which is reflected off nearby walls and surf aces . The
listener hears this combination of primary and reflected sound as a moving audio
field. Adding a second cabinet further enhances the effect. Even when the audio
source (organ) is mono, the rotating speaker elements and reflected sound create
a realistic stereo effect.
The RFX147 Rotorhorn simulates the Leslie speaker effect unlike any other
electronic simulator by utilizing an internal crossover . This provides a way to effect
the upper and lower frequencies differently m uch lik e a real rotating speak er. A
more authentic effect is thus produced.
1 6
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