kbr 3d_clipped_rev_1.png

Awesome Rotary Speaker Keyboard Amp


Need swirlicious organ sounds that only a real mechanical rotary speaker system can provide? Motion Sound has an excellent suggestion for you: the Motion Sound KBR-3D. The KBR-3D sports two stereo channels: Hi-Fidelity (for synths, pianos, etc.) and Rotary (for organ). A 12AX7 in the preamp stage lets you dial in the preferred amount of tube grit. You get tons of control over your sound, including a 3D spatial expander that greatly expands your stereo image, and an included footswitch that lets you control rotor speed. Factor in its curb weight of only 70 pounds, and the Motion Sound KBR-3D makes an ideal gigging keyboard amp.


Motion Sound KBR-3D Mechanical Rotary Speaker System at a Glance:
  • From your synths to organ, the KBR-3D handles it all
  • Engineered to sound amazing
From your synths to organ, the KBR-3D handles it all

We have equipped the KBR-3D with two stereo channels - Hi-Fidelity, for pristine amplification of your stage piano and synthesizers, and Rotary, for those delicious, swirlicious organ sounds you crave. Between the two, you've got any gig or studio session covered.


Engineered to sound amazing

The KBR-3D sounds fantastic, and it gives you a ton of control over your sound. It sports a 12AX7 in its preamp stage, letting you dial between squeaky-clean and crunchy tube overdrive - and all points in between. You also get a contour control (4-7khz) that lets you emulate the frequency response of vintage rotary speakers. The Post Gain pot controls the volume of the rotary horns and low-rotor simulator. The Stereo simulator is mixed into the Hi-Fidelity channels. Two microphones are built in with level controls mixed into the XLR line outputs. It all adds up to one stunning keyboard amp!


Motion Sound KBR-3D Mechanical Rotary Speaker System Features:
  • Two 10" speakers; two 3.5" ferro-cooled horns
  • 80-watt MS 1.2 rotary-horn driver
  • Stereo low-rotor simulator for fat, punchy low end
  • Two stereo channels: Hi-Fidelity (synths, pianos, etc.) and Rotary (organ)
  • Two pairs of 1/4" inputs with separate volumes plus global 3-band EQ
  • Fast/Slow/Stop rotary speed control 2-button footswitch (included)
  • Bass, horn volume, and effect level controls
  • Two microphones on rotary horn, rear panel mixer to outputs
  • 1/4" rear-panel power amp line inputs
  • XLR L/R outputs include all signals for PA feed
  • Curb weight: a manageable 70 pounds!

Tech Specs


                                                                              Speaker Size                                2 x 10", 2 x 3.5"

                                                                              Total Power                                 2 x 100W

                                                                              Frequency Range                       50Hz-15kHz

                                                                              Enclosure Material                     MDF

                                                                              Mounting Options                      Floor

                                                                              Inputs                                           6 x TRS"

                                                                              Outputs                                        2 x XLR

                                                                              Height                                           21"

                                                                              Width                                            24.5"

                                                                              Depth                                           16.5"

                                                                              Weight                                          70 lbs.

press to zoom
press to zoom