Boss RT-20 Rotary Ensemble


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The sound of a Leslie-style rotary speaker is one of the most iconic effects in electric music history, its throb and flutter instantly recognizable on guitar, vocals, or organ tracks on some of the classic songs from the 60s and 70s.  This effect was originally built into Hammond organs, but guitarists and adventurous producers quickly started creating new and interesting sounds by running other signals through this massive wooden box.  What they lacked in portability, they made up for in tone, and people still use real Leslies to this day.  In terms of practicality, however, it's not far from the bottom of the list.  A real rotating speaker can weigh upwards of 100 pounds, and requires a lot more to get it working than just plugging your guitar into the front of one.  Luckily, the folks at Boss are on the case, and they developed the RT-20 Rotary Ensemble specifically to capture the magic of that sound with any rig.

Thanks to the RT-20 you can get all the classic rotary speaker sounds but without the hassle or bulk of the real unit.  The RT-20 features control over multiple parameters including individual speed controls for the slow and fast speeds, horn/bass balance, rise time, overdrive, and separate levels for your effected and dry signals.  Dual footswitches mean you have instant access to both the bypass options and to toggle between the slow and fast speeds (complete with realistic ramp up and down sounds), and you can also use an external expression pedal to variably control the speed.  Stereo inputs and outputs mean that the RT-20 will fit in no matter what kind of rig you're running (the effect sounds HUGE in stereo).  It even features an input switch that revoices the gain section to better match either guitar or keyboards.  If you're looking for authentic rotary speaker sounds that will fit on your pedalboard. the RT-20 Rotary Ensemble by Boss is what you need.  Come try one today and rotate your life!


  • Authentic rotary sounds that you can fit in your gig bag
  • Individual levels for Effected and Dry signal
  • Dedicated Fast/Slow footswitch with realistic ramping sounds
  • Built in overdrive circuit
  • Compatible with expression pedals like the Boss EV-5 or EV-30 (sold separately)


  • Buffered bypass
  • Standard 9VDC Center Negative power jack or 6 x AA batteries
  • 2 x 1/4" input jacks, 2 x 1/4" output jacks
  • Height: 2.25"
  • Width: 6.8"
  • Depth: 6.25"
  • Weight: 2.8 lbs

    Type: Effects