Boss Rotary Ensemble RT-20 Owner's Manual
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Boss Rotary Ensemble RT-20 Owner's Manual

Boss owner's manual rotary sound processor rt-20
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Thank you, and congratulations on your choice of BOSS RT-20 Rotary Sound Processor.
Before using this unit, carefully read the sections entitled: "USING THE UNIT SAFELY"
and "IMPORTANT NOTES" (separate sheet).
These sections provide important information concerning the proper operation of the unit.
Additionally, in order to feel assured that you have gained a good grasp of every feature
provided by your new unit, this manual should be read in its entirety. The manual should
be saved and kept on hand as a convenient reference.

Main Features

● COSM Modeling faithfully creates the speaker characteristics, internal cabinet resonance,
rotation speed adjustments, and other particular elements of the rotary speaker to provide
realistic reproduction of the rotary speaker sound.
● Includes overdrive, a must for rock sounds.
● Features four internal sounds, from the conventional rotary sound to rock sounds and UNI-
V, a sound known and loved by many guitarists.
● Expression pedal can be used to freely control the rotation speed.
● Permits adjustment of the balance for the horn speaker and bass speaker volume levels,
something difficult to accomplish with the original speakers. Use the knob to make changes
in the tone, from sharp to mild, in real time.
● Features Virtual Rotor Display that displays the speaker rotation effectively as a visual
image.
COSM (Composite Object Sound Modeling)
Composite Object Sound Modeling (COSM) is BOSS/Roland's
innovative and powerful sound modeling technology.
COSM analyzes the many factors that make up the original sound,
such as the electrical and physical characteristics of the original, and
then produces a digital model that can reproduce the same sound.
Copyright © 2005 BOSS CORPORATION
All rights reserved. No part of this publication may be reproduced in
any form without the written permission of BOSS CORPORATION.

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Summary of Contents for Boss Rotary Ensemble RT-20

  • Page 1: Main Features

    Thank you, and congratulations on your choice of BOSS RT-20 Rotary Sound Processor. Before using this unit, carefully read the sections entitled: “USING THE UNIT SAFELY” and “IMPORTANT NOTES” (separate sheet). These sections provide important information concerning the proper operation of the unit.

  • Page 2: Table Of Contents

    When Switching from SLOW to FAST and FAST to SLOW ... 9 Mixing the Direct Sound... 9 Operating the SLOW/FAST Pedal... 9 Operating the BRAKE ... 10 Controlling the RT-20 with an Expression Pedal... 10 Names of Things and What They Do... 11 Front Panel ... 11 Mode List ... 13 Rear Panel ...

  • Page 3: Installing Batteries

    Installing Batteries Batteries are supplied with the unit. The life of these batteries may be limited, however, since their primary purpose was to enable testing. Insert the included batteries as shown in figure, being careful to orient the batteries correctly. fig.010 •...

  • Page 4: Making The Connections

    Making the Connections • The use of an AC adaptor is recommended as the unit’s power consumption is relatively high. Should you prefer to use batteries, please use the alkaline type. • Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit.

  • Page 5: Mono Connection

    Mono Connection ■ Guitar fig.020 Set DRIVE TYPE switch Electric Guitar ■ Keyboard fig.030 Set DRIVE TYPE switch Keyboard to GUITAR Guitar Amp to KEYBOARD Making the Connections AC Adaptor PSA series (sold separately) AC Adaptor PSA series (sold separately) Mixer...

  • Page 6: Stereo Connection

    Making the Connections Stereo Connection ■ Guitar fig.060 Set DRIVE TYPE switch Effector ■ Keyboard fig.070 Set DRIVE TYPE switch Keyboard to GUITAR Electric Guitar to KEYBOARD AC Adaptor PSA series (sold separately) Guitar Amp AC Adaptor PSA series (sold separately) Mixer...

  • Page 7: Operating The Rt-20

    Operating the RT-20 Pedal Operation When “ON” When “OFF” EFFECT ON/OFF Pedal Alternately switches the effect on or off each time the pedal is pressed. When switched off, the sound input to the INPUT jack is output without change. When set to “SLOW”...

  • Page 8: Panel Operation

    3. Turn the OVERDRIVE knob to adjust the amount of drive applied. 4. Adjust the EFFECT ON volume by turning the EFFECT LEVEL knob. While the settings described above produce a rotary speaker sound, The RT-20 allows you to control the following factors that are difficult to control with conventional rotary speakers.

  • Page 9: Adjusting The Balance Of The Horn Rotor And Bass Rotor Volume

    Turning these knobs to the center position sets the rotor speed to the standard rotation speed. fig.082 Operating the RT-20 Adjusting the Rate at Which the Speed Changes When Switching from SLOW to FAST and FAST to SLOW You can adjust the rate at which the rotation changes from slow to fast and vice versa with the RISE TIME knob.

  • Page 10: Operating The Brake

    RT-20 switches to the value set with the SLOW SPEED knob; depressing the pedal all the way switches the RT-20 to the value set with the FAST SPEED knob. * The SLOW/FAST indicator flashes when an expression pedal is connected.

  • Page 11: Names Of Things And What They Do

    Names of Things and What They Do Front Panel RISE TIME Knob This adjusts the rate at which the rotation changes from slow to fast and vice versa. When this knob is at the center position, the rotary speaker rotation changes at the standard rate. MODE Knob Use this to select the rotary speaker effect from the four...

  • Page 12: Power Indicator

    Names of Things and What They Do VIRTUAL ROTOR Display This display uses indicators and moving light beams to indicate the rotary speaker effect visually. The HORN rotor is indicated with the red light, the BASS rotor with blue. EFFECT ON/OFF Indicator This lights up when the effect is on.

  • Page 13: Mode List

    * The trademarks listed in this document are trademarks of their respective owners, which are separate companies from BOSS. Those companies are not affiliated with BOSS and have not licensed or authorized BOSS’s RT-20. Their marks are used solely to identify the equipment whose sound is simulated by BOSS’s RT-20.

  • Page 14: Rear Panel

    (such as the Roland EV-5) to this jack. You can use the connected pedal to control the rotor’s rotation speed in real time. “Controlling the RT-20 with an Expression Pedal” (p. 10) Headphone Jack (PHONES) You can listen through headphones by connecting the headphones here.

  • Page 15: Troubleshooting

    Troubleshooting The power doesn’t come on. ❍ Is the guitar or keyboard connected correctly to the INPUT A (MONO) jack? → Check the connections again (p. 4–p. 6). * When running off batteries, the unit won’t switch on unless there’s something plugged into the INPUT jack.

  • Page 16: Sample Settings

    Sample Settings * Set the DRIVE TYPE switch on the rear panel to match the type of instrument being used. ■ STANDARD SOUND ■ TREMOLO CHORUS ■ WILD SPIN ■ UNI-V...

  • Page 17: Setting Memo

    Setting Memo...

  • Page 18: Main Specifications

    Main Specifications RT-20: Rotary Sound Processor Nominal Input Level -20 dBu Input Impedance 1 MΩ Output Impedance 1 kΩ Recommended Load Impedance 10 kΩ or greater Display VIRTUAL ROTOR Controls EFFECT ON/OFF pedal SLOW/FAST pedal OVERDRIVE knob BALANCE knob RISE TIME knob...
  • Page 19 This product complies with the requirements of European Directive 89/336/EEC. FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
  • Page 20 G6017153R1...

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