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Boss RT-20 Rotary Ensemble Sound Processor  

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Top Rated

Overview

  • Authentic rotary speaker sounds via COSM® technology
  • Slow/Fast transition time is adjustable from gradual to rapid change; optional Expression pedal can control speed in real time
  • Onboard Overdrive effects
Description & Specs
  • MSRP:
    $305.50
  • Your Savings:
    - $86.50
  • Your Price:
    $21900
2 Used From $175.20

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Boss

An easy-to-use and versatile rotary speaker effect.

From the Beatles to Jeff Beck, Santana to Stevie Ray, many guitar greats have incorporated the rotary speaker into their rigs. With this in mind BOSS proudly presents the RT-20 Rotary Sound Processor. Employing COSM®-modeling technology, the RT-20 authentically reproduces classic rotary-speaker sounds. It offers adjustable Rise Time, Horn and Bass speed, Overdrive, and more. And not just for classic twirl, the RT-20 can be used to create unique overdrive and pulsating effects as well. This pedal sounds amazing, and offers a stunning graphical view of the virtual rotors on its built-in display.

Features

  • Authentic rotary speaker sounds via COSM® technology
  • Slow/Fast transition time is adjustable from gradual to rapid change; optional Expression pedal can control speed in real time
  • Onboard Overdrive effects
  • Adjustable mix balance between Treble Rotor and Bass Rotor
  • 4 types of sounds, from standard rotary speaker effects to rock-oriented tones, UNI-V, and more
  • Guitar/Keyboard switch

Get the classic rotary sound you want. Call or click to order now!

 

RT-20 Rotary Ensemble Sound Processor Specifications:

  • Nominal Input Level: -20 dBu
  • Input Impedance: 1 M ohms
  • Output Impedance: 1 k ohms
  • Recommended Load Impedance: 10 k ohms
  • Display: VIRTUAL ROTOR
  • Controls: EFFECT ON/OFF pedal, SLOW/FAST pedal, MODE knob, RISE TIME knob, EFFECT LEVEL knob, DIRECT LEVEL knob, BALANCE knob, OVERDRIVE knob, SLOW SPEED knob, FAST SPEED knob, DRIVE TYPE switch
  • Indicators: POWER(serves also as battery check indicator), EFFECT ON/OFF, SLOW/FAST
  • Connectors: INPUT A (MONO) jack (1/4 inch phone type), INPUT B jack (1/4 inch phone type), SPEED (EXP PEDAL) jack (1/4 inch phone type), PHONES jack (stereo 1/4 inch phone type), OUTPUT A (MONO) jack (1/4 inch phone, type), OUTPUT B jack (1/4 inch phone type), AC Adaptor jack
  • Power: DC 9 V=Dry battery (R6/LR6 (AA) type) x 6, AC Adaptor (PSA-series)
  • Accessories: Owner’s Manual, Dry battery x
  • Dimensions: W 6-13/16" x D 6-1/4" x H 2-1/4"
  • Weight: 2 lb. 7 oz.
Customer Reviews
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Review Snapshot®

by PowerReviews
BossRT-20 Rotary Ensemble Sound Processor
 
4.7

(based on 33 reviews)

Ratings Distribution

  • 5 Stars

     

    (27)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (0)

86%

of respondents would recommend this to a friend.

Pros

  • Excellent sound quality (6)
  • Versatile (6)
  • Responsive (5)
  • Compact (4)
  • Good selection of effects (4)

Cons

    Best Uses

    • Performances (6)
    • Home studio (5)
    • Professional recording (5)
    • Amateur recording (4)
    • Outdoor events / games (3)
      • Reviewer Profile:
      • Experienced (4), Professional musician (3)

    Most Liked Positive Review

     

    Boss RT-20

    owned rt-20 for 6 months, using it in stereo for guitar application. I'va added EQ to the front of the RT-20 to boost 600hz and 1200hz. Lets you voice chords across...Read complete review

    owned rt-20 for 6 months, using it in stereo for guitar application. I'va added EQ to the front of the RT-20 to boost 600hz and 1200hz. Lets you voice chords across the horn / rotor crossover. If you are lookin for SRV Coldshot this is likely not the pedal for you. If you know what a leslie can do, man this is the s**t. Working the footswitch to take advantage of the interial effect can liven up your playing big time. This nuance is the strengeth of a leslie IMO, The effect has a bit of a gritty edge to it. The magic is accomplished by voicing your notes chords and appropriately changing timing speed changes. The youtube demos do not do this pedal justice. You need to be playing and tapping the tremolo chorale speeds with your feet not your fingers.

    VS

    Most Liked Negative Review

     

    Very Expensive Phase Shifter

    First of all I OWN a Leslie 145, so I have a benchmark for the sound of Leslie guitar. After waiting a long time for two of these pedals, I must register my...Read complete review

    First of all I OWN a Leslie 145, so I have a benchmark for the sound of Leslie guitar. After waiting a long time for two of these pedals, I must register my disappointment in the audio and sonic quality of this pedal for guitar. The real Leslie sound is truly rooted in the horn aspect of the sound for guitar which is a very nasally midrange to high curve with almost the "Q" of a half-depressed wah pedal. The RT-20 fully misses this true characteristic and really sounds dull compared to many other Leslie simulators both old and new. With the "Balance" control set to full "Horn" the treble is bland and lacks the humped frquency response of the actual Leslie horn. There is always too much distortion even with the "Overdrive" in the"off" setting and the mode set to "I" with both single coils and humbuckers when using this pedal. I was hoping to achieve the classic "Badge" sound or something like Leslie West on "Nantucket Sleighride" but no such luck. Just a swishy, ill-defined phase sound that none of the four amps I tried could resolve any better. The Uni-Vibe setting was muddy and also ill-defined, not even as good as the Boss Modeling Wah pedal(PW-10). The RT-20 sounds more like a very sophisticated phase shifter rather than a rotary simulator. The current Line 6 Roto-Machine is far better at making the classic Leslie sounds for guitar--especially when used on the "145" setting.

    Reviewed by 33 customers

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    (1 of 1 customers found this review helpful)

     
    4.0

    LOVE This!!!!

    By PentecostalHammond

    from Richmond, VA

    About Me Experienced

    Pros

    • Excellent Sound Quality
    • Good Selection Of Effects
    • Responsive
    • Versatile

    Cons

    • Exp Pedal Option Weak

    Best Uses

    • Hammond Organ
    • Performances

    Comments about Boss RT-20 Rotary Ensemble Sound Processor:

    Love this pedal! the speed options and the distortion work well... I use this in a small church where it's not much room for a leslie, and leslie's are costly. with a 1/4 out added to a C2 this pedal has experiened organist looking for a leslie. my omly issue that the exp pedal option does not gradually increase/decrease speed.

    Comment on this review

    (1 of 1 customers found this review helpful)

     
    5.0

    Love it!

    By Mickie

    from Sarver, PA

    About Me Professional Musician

    Verified Buyer

    Pros

    • Compact Design
    • Excellent Sound Quality
    • Good Selection Of Effects
    • Responsive
    • Versatile

    Cons

      Best Uses

      • Amateur Recording
      • Events
      • Home Studio
      • Mobile DJ
      • Performances
      • Professional Recording

      Comments about Boss RT-20 Rotary Ensemble Sound Processor:

      Best purchase I made in along time.

      Comment on this review

      (2 of 2 customers found this review helpful)

       
      4.0

      Great

      By Jimo slice

      from under the freeway overpass

      About Me Experienced

      Verified Buyer

      Pros

      • Compact Design
      • Excellent Sound Quality
      • Good Selection Of Effects
      • Responsive
      • Versatile

      Cons

        Best Uses

        • Amateur Recording
        • Events
        • Home Studio
        • Performances
        • Professional Recording

        Comments about Boss RT-20 Rotary Ensemble Sound Processor:

        Yoooo

        Works just like you would think. I found that i leave mine on the slow setting 90% of the time. It seems to thicken the tone and adds almost a phaser effect. I got it thinking i would use the fast feature more but the slow speed is just a good ole baseline sound to build from. Adding other pedals with it gets overwhelming fast but i found it takes the place of things like delay and overdrive if you tweak it right. The only true downside is that the gain is OOC, anything past level 3 sounds like a blown sub in a VW bug, just awful. However the 0-3 sweep can be useful. Not a perfect repo of a RT but close enough, especcaly in a band setting it gets the point across just fine. (works in stereo also).

        Overall, it has a great sound, easy to use, get one.

        Comment on this review

        (1 of 1 customers found this review helpful)

         
        5.0

        WOW!

        By Tubehed

        from Westminster, CA

        About Me Experienced

        Ask me a question

        Pros

        • Compact Design
        • Excellent Sound Quality
        • Good Selection Of Effects
        • Responsive
        • Versatile

        Cons

          Best Uses

          • Amateur Recording
          • Events
          • Home Studio
          • Performances
          • Professional Recording

          Comments about Boss RT-20 Rotary Ensemble Sound Processor:

          I have always loved the sound of a Leslie. Whether we are talking about a Hammond B-3 or or a Fender Strat, an instrument just sounds more soulful and etherial when played through a rotating speaker system. For years, I tried to approximate this sound by using different combinations of flanger, chorus, phaser and tremolo effects. And, while I would often be able to dial in some cool tones, I always ended up with something that, at best, sounded "Leslie-esque" but clearly not like the real deal. The RT-20 gets me as close to the "real deal" as I will probably ever need.

          When you think about how hard it is accurately simulate a complex electromechanical device like a Leslie and shrink it down to the weight and size of an effects pedal, it is pretty amazing how close this pedal sounds to the real thing. I know purists will argue that the RT-20 can't capture some of the more subtle sonic qualities of a real Leslie-I don't think ANY simulator can because it is physically impossible. That said, I know which device I'd rather lug to practice sessions and gigs!

          I haven't tried the other rotary sims out there, including the Strymon Lex or the H&K Rotosphere. Could they be even better than the RT-20? Maybe. Depending on who you ask, the RT-20 is either superior, equal or inferior to those and other units. All I know is that the RT-20 gives me the sound and features I've always wanted and I am totally satisfied with the Leslie settings on this pedal.

          The Uni-Vibe setting has gotten mixed reviews, with some people dismissing it as "fake" sounding and others describing it as authentic and useful. I think that Boss did a really good job of modeling a Uni-Vibe. You can dial in some pretty convincing tones by adjusting the rate and intensity controls. If you are really particular about Uni-Vibe tone, I would go for a unit that uses actual bulbs, photocells and staggered phasing stages like the original. Also, with both the Leslie and Uni-V settings, I have found that both sound MUCH better when using an overdrive or distortion pedal AFTER the RT-20. The built in overdrive is only useful at lower settings and I prefer to use a seperate OD anyway.

          I have been playing guitar for over 25 years and I have to say that the RT-20 is at the top of my list of favorite effects pedals. If you dig the Leslie sound, you owe it to yourself to check it out.

          Comment on this review

          (3 of 3 customers found this review helpful)

           
          5.0

          Close to the Real Thing

          By Gray-E4u2T

          from The South

          About Me Professional Musician

          Ask me a question

          Pros

          • Compact Design
          • East To Use
          • Excellent Sound Quality
          • Versatile

          Cons

          • None

          Best Uses

          • Home Studio
          • Performances
          • Professional Recording

          Comments about Boss RT-20 Rotary Ensemble Sound Processor:

          I had a Leslie years ago that was modified for guitar. I always loved the effect. I have tried many units to achieve that sound again but it just wasn't the same. This pedal is as close as I have come and I couldn't be more pleased. Being able to adjust the balance of the horn and bass baffle is a really nice touch. The UniVibe effect is a real bonus. This pedal is dangerously close to the real thing and sure beats hauling the real thing around (not to mention all the mics you need). Try one.

          Comment on this review

          (4 of 6 customers found this review helpful)

           
          4.0

          Best thing next to a leslie

          By DIEGO

          from Fort Worth

          About Me Professional Musician

          Verified Buyer

          Pros

          • Excellent Sound Quality
          • Responsive
          • Versatile

          Cons

            Best Uses

            • Amateur Recording
            • Home Studio
            • Performances
            • Professional Recording

            Comments about Boss RT-20 Rotary Ensemble Sound Processor:

            Lots of versatility with this effect. Dial in the kind of edge you want, low or high distinction and guitar or keyboard selection. If you can get the real thing get it but if you can't lug a leslie around and you want the effect this is it. Great visual that lets you see the rotation speed and great adjustable braking that makes that rise and fall excitement we all love. I have been a professional studio musician for 40 years and I would highly recommend this unit. I only gave it 4 stars because it is in fact not a leslie.

            Comment on this review

            (1 of 5 customers found this review helpful)

             
            3.0

            Was not impressed for my instruments

            By Splash

            from Bellefonte, PA

            About Me Experienced

            Verified Buyer

            Pros

              Cons

                Best Uses

                  Comments about Boss RT-20 Rotary Ensemble Sound Processor:

                  For anyone who is using the unit for a keyboard, it will not really do much good if your keyboard already has the capabilities of doing its own reverb and chorus.

                  Comment on this review

                  (4 of 4 customers found this review helpful)

                   
                  5.0

                  WOW

                  Comments about Boss RT-20 Rotary Ensemble Sound Processor:

                  Always wanted those sounds but didn't want to buy 5 or 6 separate pedals. This thing is AWESOME. Wouldn't trade it for anything, except an actual Lezlie cab.

                  Comment on this review

                  (4 of 4 customers found this review helpful)

                   
                  5.0

                  Awesome!

                  By Dianna Anderson

                  from Atlanta, GA.

                  Comments about Boss RT-20 Rotary Ensemble Sound Processor:

                  You can't get any closer to the Leslie sound without actually having a Leslie. The only thing I wish it did differently is to switch instantly from low to high rotation, instead of speed up and slow down. Then again, maybe an expression pedal might do the trick.
                  Hi and Lo rotors
                  No problems whatsoever, love the tone.
                  I could never afford, or transport, a Leslie. This pedal does what I want it to, at a much cheaper price and smaller size and weight!

                  Comment on this review

                  (3 of 4 customers found this review helpful)

                   
                  5.0

                  B3 in a Boss box

                  By jaleke2000

                  from Macon, Georgia

                  Comments about Boss RT-20 Rotary Ensemble Sound Processor:

                  Never written a review in my life, but I am so impressed with the Boss RT20 I just had to. Been researching leslie sims for awhile now to use with organ. DLS,H&K,NEO, you name it. Neo ventilator very good but no better then the RT20. And what a wad of cash to save. It was a no brainer for me. Oh yeah it's got pretty lights. The ramp speed is very authentic. Great sampling of bass speaker and horn.

                  Comment on this review

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