Add some classic rotary speaker tones to your guitar or keyboard rig with the BOSS RT-20 Rotary Ensemble Pedal. The rotary speaker sound has been adding mojo to guitar sounds over several decades, gracing countless recordings from the Beatles to Joe Bonamassa. The RT-20 is modeled on the famed Leslie 122 speaker, and recreates those legendary tones, but without the bulk and weight of a massive rotary cabinet. Rather, you can place the RT-20 in your guitar’s or keyboard’s signal chain and enjoy the rotary speaker effect on your tone. Four modes are offered, ranging from a traditional rotary speaker effect to a classic ’60s/’70s Uni-Vibe type effect. You can even add some grit by using the Overdrive control. The RT-20 can operate in mono or stereo, and has a connection for an optional expression pedal (sold separately) to control the rotor’s rotation speed in real time.
Features
- Rotary Speaker Emulator
- Models Vintage Leslie 122 Speaker
- Onboard Overdrive Effects
- Works with Guitar and Keyboard
- Four Rotary Effect Modes
- Control Bass and Treble Separately
- External Expression Pedal Control
- Buffered Bypass
Specifications
| Inputs | 2 x unbalanced 1/4″ instrument TS 1 x 1/4″ expression pedal jack |
| Nominal Input Level | Instrument: -20 dBu |
| Input Impedance | 1 MOhm |
| Outputs | 2 x unbalanced 1/4″ instrument TS 1 x stereo 1/4″ headphones TS |
| Output Impedance | 1 kOhm |
| Recommended Load Impedance | 10 kOhms or greater |
| Display | Virtual Rotor |
| Controls | EFFECT ON/OFF pedal SLOW/FAST pedal OVERDRIVE knob BALANCE knob RISE TIME knob MODE knob FAST SPEED knob SLOW SPEED knob DIRECT LEVEL knob EFFECT LEVEL knob DRIVE TYPE switch |
| Indicators | POWER (also serves as battery check indicator) EFFECT ON/OFF SLOW/FAST |
| Power Supply | 9 VDC: Dry battery, 6x AA (LR6/R6) Optional AC Adapter (PSA-Series, available separately) |
| Current Draw | 85 mA (9 V max.) |
| Expected Battery Life | Carbon: 6 hours Alkaline: 10 hours These figures will vary depending on the actual conditions of use |
| Dimensions | 6.8 x 6.3 x 2.3″ / 173 x 158 x 57 mm |
| Weight | 2.4 lb / 1.1 kg |
| Package Weight | 3.3 lb |
| Box Dimensions (LxWxH) | 9 x 7.5 x 3.5″ |













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