Boss Audio Systems RT-20 User Manual
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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 UNIV, 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.
Contents
Main Features .................................................. 1
Installing Batteries ........................................... 3
Making the Connections ................................... 4
Mono Connection ............................................................................ 5
Stereo Connection........................................................................... 6
Operating the RT-20......................................... 7
Pedal Operation .............................................................................. 7
Panel Operation .............................................................................. 8
Adjusting the Balance of the HORN Rotor and BASS rotor volume ....... 9
Adjusting the Rotor’s Rotation Speed .......................................................... 9
Adjusting the Rate at Which the Speed Changes
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 .................................................................................... 14
Troubleshooting ............................................. 15
Sample Settings ............................................. 16
Setting Memo................................................. 17
Main Specifications ........................................ 18
2
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
• When turning the unit upside-down, get a bunch of newspapers or magazines, and
place them under the four corners or at both ends to prevent damage to the buttons
and controls. Also, you should try to orient the unit so no buttons or controls get
damaged.
• When turning the unit upside-down, handle with care to avoid dropping it, or
allowing it to fall or tip over.
• Make sure the “+” and “–” ends of the batteries are oriented correctly.
• When the batteries run down, the POWER indicator gets dim. If this happens, replace
with new batteries.
• When replacing the batteries, use six AA type.
• Avoid using new batteries together with used ones. In addition, avoid mixing different
types of batteries. Doing so can result in fluid leakage.
• Battery life can vary depending on battery type.
Continuous usage time under battery power is about 10 hours with alkaline batteries
and about 6 hours with carbon batteries. (This may vary according to usage
conditions.)
3
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. Such noise could occur when receiving or initiating
a call, or while conversing. Should you experience such problems, you should relocate
such wireless devices so they are at a greater distance from this unit, or switch them
off.
• Use a cable from Roland to make the connection. If using some other make of
connection cable, please note the following precautions.
• Some connection cables contain resistors. Do not use cables that incorporate resistors
for connecting to this unit. The use of such cables can cause the sound level to be
extremely low, or impossible to hear. For information on cable specifications, contact
the manufacturer of the cable.
• When the unit is running on battery power, the power comes on when you insert the
connector plug into the INPUT A (MONO) jack.
• To prevent malfunction and/or damage to speakers or other devices, always turn
down the volume, and turn off the power on all devices before making any
connections.
• If there are batteries in the unit while an AC adaptor is being used, normal operation
will continue should the line voltage be interrupted (power blackout or power cord
disconnection).
• Once the connections have been completed, turn on power to your various devices in
the order specified. By turning on devices in the wrong order, you risk causing
malfunction and/or damage to speakers and other devices.
When powering up: Turn on the power to your guitar amp last .
When powering down: Turn off the power to your guitar amp first .
• Always make sure to have the volume level turned down before switching on power.
Even with the volume all the way down, you may still hear some sound when the
power is switched on, but this is normal, and does not indicate a malfunction.
• When operating on battery power only, the POWER indicator will become dim when
battery power gets too low. Replace the battery as soon as possible.
• When moved from one location to another where the temperature and/or humidity is
very different, water droplets (condensation) may form inside the unit. Damage or
malfunction may result if you attempt to use the unit in this condition. Therefore,
before using the unit, you must allow it to stand for several hours, until the
condensation has completely evaporated.
4
5
■
Mono Connection
Guitar
fig.020
Set DRIVE TYPE switch
Electric Guitar
Keyboard
fig.030
Set DRIVE TYPE switch
to KEYBOARD
■
to GUITAR
Making the Connections
AC Adaptor
PSA series
(sold separately)
Guitar Amp
Keyboard
AC Adaptor
PSA series
(sold separately)
MTR Mixer
Making the Connections
Stereo Connection
Guitar
fig.060
Set DRIVE TYPE switch
to GUITAR
6
■
■
AC Adaptor
PSA series
(sold separately)
Effector
Keyboard
fig.070
Electric Guitar
Set DRIVE TYPE switch
to KEYBOARD
Keyboard
Guitar Amp
AC Adaptor
PSA series
(sold separately)
MTR Mixer
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