Roland KC-400 Keyboard Combo Amplifier 150 Watts

Quick Product Summary

The Roland KC-400 is a powerful 150-watt keyboard combo amplifier designed to reproduce stage pianos, synthesisers, organs, drum machines and other electronic instruments with clarity across a wide frequency range.

A custom 12-inch woofer and horn tweeter provide strong low-end response and clear highs, while the integrated mixer offers four stereo input channels, an XLR microphone input and auxiliary connections. Stereo Link, Sub Out and line-level outputs make the KC-400 a versatile choice for rehearsals, gigs and multi-keyboard setups.

What Makes the Roland KC-400 Special?

Keyboard amplification needs to handle everything from deep piano fundamentals and organ bass through to bright synth leads and detailed acoustic sounds. The KC-400 combines a 150W amplifier with a two-way speaker system and Roland's twin bass-reflex cabinet design, providing powerful, balanced reproduction across the keyboard's full range.

Its integrated mixer is equally important. Up to four stereo instrument sources can be connected, Channel 1 accepts a microphone via balanced XLR, and Channel 4 includes flexible monitoring options. Stereo Link also lets you connect a second KC-400 for true stereo reproduction and an expanded input setup.

Who Is It For?

The Roland KC-400 is ideal for gigging keyboard players, stage pianists, synthesiser players, electronic musicians and performers who need a powerful self-contained amplification system.

It is particularly useful for musicians running several keyboards or sound sources at once, as well as rehearsal rooms, teaching spaces and compact live setups where an onboard mixer can reduce the amount of additional equipment required.

At A Glance

Feature	Details
Amplifier Type	Keyboard combo amplifier
Rated Output	150W
Main Speaker	12-inch woofer
High-Frequency Driver	Horn tweeter
Input Channels	4 stereo channels
Microphone Input	Balanced XLR
EQ	3-band master EQ
Stereo Link	Yes

What’s Included?

• Roland KC-400 Keyboard Combo Amplifier

• Owner's Manual

Technical Specifications

Amplifier

Rated Power Output: 150W

Speaker System

Woofer: 30cm / 12-inch x 1
High-Frequency Driver: Horn Tweeter x 1

The two-way speaker arrangement is designed to reproduce the extended frequency range required by modern keyboards and electronic instruments.

Input Channels

Channel 1

• Balanced XLR microphone input

• L/Mono 1/4-inch input

• R 1/4-inch input

• Mic/Line level control

Channel 2

• L/Mono 1/4-inch input

• R 1/4-inch input

• Independent level control

Channel 3

• L/Mono 1/4-inch input

• R 1/4-inch input

• Independent level control

Channel 4 / Monitor

• L/Mono 1/4-inch input

• R 1/4-inch input

• Independent level control

• Output Select control

Auxiliary Inputs

Additional connections are provided for backing tracks, music players and other external audio sources:

• Stereo RCA input

• Stereo mini-jack input

• Dedicated auxiliary level control

Equalisation

Three-band master EQ:

• Low

• Middle

• High

A dedicated Shape switch provides additional tonal adjustment.

Line Outputs

• L/Mono 1/4-inch Line Out

• R 1/4-inch Line Out

These allow the KC-400's mixed signal to be sent to a compatible mixer, PA system, recording interface or other amplification equipment.

Subwoofer Output

Sub Out: 1/4-inch

A compatible powered subwoofer can be added when additional low-frequency reinforcement is required.

Stereo Link

Dedicated Stereo Link input and output connections allow two compatible KC-400 amplifiers to operate together.

Stereo Link provides:

• True stereo amplification

• Wider stereo imaging

• Expanded input capacity

• Separate left and right reproduction from stereo keyboards

Headphone Output

Connection: Stereo 1/4-inch TRS

A dedicated headphone volume control is provided.

Controls

• Power switch

• Shape switch

• Channel 1 Mic/Line

• Channel 2 Line

• Channel 3 Line

• Channel 4 Line

• Channel 4 Output Select

• Auxiliary level

• Headphone volume

• Low EQ

• Middle EQ

• High EQ

• Master volume

Nominal Input Levels

Channel 1: -50 to -20dBu
Channels 2–4: -20dBu
Aux Input: -10dBu
Stereo Link Input: 0dBu

Nominal Output Levels

Line Output: +4dBu
Sub Output: +4dBu
Stereo Link Output: 0dBu

Dimensions

Width: 490mm
Depth: 385mm
Height: 470mm

Weight

22kg

Power Requirements

Power Supply: Internal AC mains power supply
Power Consumption: 40W

The KC-400 connects directly to mains power and does not require an external power adaptor or power supply.

FAQs

How powerful is the Roland KC-400?

The KC-400 delivers 150 watts of rated output power, providing ample volume and headroom for rehearsals, stage monitoring and many live performance applications.

What speaker does the KC-400 use?

It features a 12-inch woofer combined with a horn tweeter, creating a two-way system designed to handle the broad frequency range produced by keyboards.

Can I connect several keyboards at once?

Yes. The KC-400 has four stereo input channels, making it ideal for multi-keyboard rigs and musicians using several electronic instruments.

Can I connect a microphone?

Yes. Channel 1 includes a balanced XLR microphone input, allowing a compatible microphone to be connected alongside your instruments.

Is the KC-400 suitable for an 88-note stage piano?

Yes. Its 12-inch woofer, 150W amplifier and wide-range speaker design make it well suited to reproducing the low frequencies and dynamic range of 88-note stage pianos.

Does the KC-400 produce stereo sound by itself?

The KC-400 uses a single two-way speaker system. For true stereo reproduction, a second compatible KC-400 can be connected using Stereo Link.

What does Stereo Link do?

Stereo Link connects two compatible KC amplifiers together, splitting left and right signals between the two cabinets while also expanding the total number of available inputs.

Can I connect the KC-400 to a PA system?

Yes. Left/Mono and Right line outputs allow the KC-400's mixed signal to be sent to a compatible PA system, mixer or recording setup.

Can I add a subwoofer?

Yes. A dedicated Sub Out is provided for connecting a compatible powered subwoofer.

Can I play backing tracks through the KC-400?

Yes. The auxiliary section provides both RCA and stereo mini-jack inputs, making it easy to connect compatible phones, tablets and music players.

Does the KC-400 have EQ?

Yes. A three-band Low, Middle and High EQ lets you shape the overall sound of the amplifier, while the Shape switch provides additional tonal adjustment.

What is Channel 4 / Monitor used for?

Channel 4 includes an Output Select control, giving performers greater flexibility when using monitoring signals such as guide tracks or click tracks.

Does the KC-400 have a headphone output?

Yes. A 1/4-inch headphone connection and independent headphone volume control are provided.

Is the KC-400 only suitable for keyboards?

No. Although designed primarily for keyboards, the KC-400 can also amplify compatible synthesisers, electronic drum equipment, drum machines, backing tracks and other line-level electronic instruments.

Does the KC-400 require an external power adaptor?

No. The amplifier has an internal mains power supply, so no external AC adaptor is required.

How heavy is the Roland KC-400?

The KC-400 weighs approximately 22kg, offering substantial power while remaining manageable for regular gigging and rehearsal use.

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