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Item # 151040 | Customer Ratings: Ratings ( 5 Based on 11 reviews)

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Boss RT-20 Rotary Ensemble Sound Processor
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      Boss RT-20 Rotary Ensemble Sound Processor (151040)
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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.

Boss RT-20 Rotary Ensemble Sound Processor 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
    Dazzling virtual-rotor display


Boss 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.


Boss RT-20 Rotary Ensemble Sound Processor

Boss pedals - 5 year parts warranty
90 day labor warranty.
1 year warranty - Multitracks, Jamstations, etc.
Check with manufacturer for specific product warranty.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 11 reviews)
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Viewing Reviews 1 - 3 of 11 |
  • Boss's BEST Pedal!!

    As reviewed by Richard on 10/27/2008

    I have been using Boss pedals since 1985, and they are fantastic. I've tried lots of other rotary speaker sim. pedals, and this one is the best. The RT-20 has more user definable parameters than most of the others, and it has almost no noise. It is the most authentic sounding Leslie tone I've heard--Jimi would have trouble telling this thing from the real article. It sounds even better with a little reverb after it.

    9 of 9 people found this review helpful.
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  • Great effect, couple issues

    As reviewed by Paul on 3/10/2011

    Instead of giving a glowing review of the RT-20, I'd like to inject a bit of reality. First off, the rotary effect itself is nothing short of amazing, effectively reproducing the Doppler swirl of the two different rotors inside a Leslie cab. Not sure how they did it, but they did it. Several options available in the RT, so it's versatile. As some others have noted, the distortion in the RT is almost unusable, coloring the tone too much. But alas, the bad news here is that there is a noise gate built into the unit which cannot be adjusted or switched off. The badder news is that it is set so that it mutes the very tails of the notes, instead of being set to a less-invasive point. And with all its knobs, you'd think if Boss HAD to put a noise gate in the thing, they'd have included something to control it. Grrr.

    6 of 6 people found this review helpful.
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  • Boss RT20

    As reviewed by Ouijam on 2/8/2010

    The RT-20 does not disappoint me. It produces a classic rotary speaker sound and captures that Pink Floyd spacey-fill guitar sound. I can an almost exact sound as in Nazareth's "Love Hurts" and some Frampton Comes Alive guitar solo sound. Our band covers Badfinger's "No Matter" and the RT20 puts the grind on the lead part very well! The RT20 is definitely part of my permanent rig.

    4 of 4 people found this review helpful.
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