The KC-400 Stereo Mixing 4-Channel Keyboard Amplifier from Roland features 150W output power, four line-input channels, a dedicated auxiliary input, and support for an XLR vocal mic. Paired with the built-in 12″ woofer and horn tweeter, the keyboard amplifier can be used by musicians and producers to amplify pianos, organs, synthesizers, rhythm machines, and other electronic instruments.

The KC-400’s cabinet is a twin bass-reflex design that provides extended low-frequency response without distortion. There is an auxiliary channel with 1/8″ and RCA inputs for connecting smartphones, music players, or other devices. Channel 1 also includes an XLR input, allowing you to plug in a vocal mic for even more versatility.

This keyboard amplifier integrates into many environments. A 1/4″ line output enables you to interface with PA systems, stage monitors, and recording devices. There’s also a sub-out jack for connecting to a powered subwoofer, with level tied to the amp’s master volume for one-touch control. Plugging into the phones jack across the top of the unit, will mute the onboard speakers. This is suitable for private practice sessions and checking sounds on stage with headphones.



  • Compact Amplifier with 150W Output Power
  • 12″ Woofer & Increased Bass Reproduction
  • Two-Way Speaker System with Horn Tweeter
  • 1/4″, RCA, XLR, and 1/8″ Inputs
  • 1/4″ Headphone, Sub Output & Line Output
  • Metal Jacks for Increased Durability



Rated Power Output 150 W
Nominal Input Level @ 1 kHz
Channel 1 (Balanced, L/Mono, R): -50, -20 dBu
Channel 2 (L/Mono, R): -20 dBu
Channel 3 (L/Mono, R): -20 dBu
Channel 4 (Monitor In L/Mono, R): -20 dBu
Auxiliary In (L, R, Stereo): -10 dBu
Stereo Link (In): 0 dBu
Nominal Output Level @ 1 kHz
Line Out: (L/Mono, R) +4 dBu
Stereo Link (Out): 0 dBu
Sub Out: +4 dBu
Speakers 1 x Woofer: 12″ (30 cm)
1 x Horn Tweeter: Not specified by manufacturer
Controls Shape button
Power switch
Channel 1: Mic/Line knob
Channel 2: Line knob
Channel 3: Line knob
Channel 4: Line knob, Output select knob
Phones: Volume knob
Equalizer: Low knob, middle, and high knob
Master knob
Indicator Power
Connectors Channel 1 Jack: XLR type
Channel 1 (L/Mono, R) Jacks: 1/4″ (6.3 mm) phone type
Channel 2 (L/Mono, R) Jacks: 1/4″ (6.3 mm) phone type
Channel 3 (L/Mono, R) Jacks: 1/4″ (6.3 mm) phone type
Channel 4 (Monitor In L/Mono, R) Jacks: 1/4″ (6.3 mm) phone type
Auxiliary In (L, R) Jacks: RCA phono type
Auxiliary In (Stereo) Jack: 1/8″ (3.5 mm) stereo miniature phone type
Sub-Out Jack: 1/4″ (6.3 mm) phone type
Phones Jack: Stereo 1/4″ (6.3 mm) TRS phone type (mono signal output)
Power Consumption 40 W
Dimensions 19.3 x 15.0 x 18.5 ” (490 x 385 x 470 mm)
Weight 48.5 lb (22 kg)


Packaging Info
Package Weight 58.2 lb
Box Dimensions (LxWxH) 22.5 x 22 x 18″



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