KMA Machines Stereo Headphone Amp Pedal

The KMA Machines Stereo Headphone Amp is a compact yet incredibly powerful stereo headphone amplifier designed for musicians, producers and performers who demand premium quality headphone monitoring wherever and whenever inspiration strikes. Built to deliver exceptional sound quality, flexible connectivity and modern stereo functionality, this versatile utility device transforms any rig into a fully immersive headphone monitoring setup.

Whether you’re practising silently, integrating backing tracks, monitoring in stereo or creating complex live IEM setups, the Stereo Headphone Amp delivers professional level performance in a portable pedalboard friendly format.

Main Features

• High quality stereo headphone amplifier
• Dual headphone outputs with master level control
• Stereo inputs and outputs
• Bluetooth audio streaming
• 3.5mm stereo AUX input
• Adjustable AUX and main signal blend control
• Flexible stereo and mono signal routing
• Buffered thru or full mix output modes
• Auto detecting mono and stereo connections
• Premium high headroom analogue circuitry
• High impedance input stage
• Ideal for pedalboards, amp sims and IEM monitoring
• Made in Berlin, Germany

Premium Stereo Headphone Monitoring

The Stereo Headphone Amp delivers pristine analogue sound quality with powerful dual headphone output stages capable of handling everything from simple practice rigs to expansive stereo pedalboard setups.

Designed for modern musicians, it allows you to hear the true stereo depth of your effects while maintaining clarity, punch and dynamic response.

Perfect for:

• Silent practice
• Pedalboard monitoring
• Amp sim setups
• Recording environments
• Stereo effects rigs
• In ear monitor systems

Flexible AUX And Bluetooth Connectivity

With built in Bluetooth audio streaming and a 3.5mm stereo AUX input, the Stereo Headphone Amp makes it easy to play along with backing tracks, trigger samples or stream music directly from your phone, tablet or computer.

The AUX signal can be blended seamlessly with your main instrument signal using the dedicated Mix control, giving you complete control over your monitoring balance.

Whether practising at home or integrating tracks into a live setup, the Stereo Headphone Amp offers exceptional flexibility.

Intelligent Stereo And Mono Routing

The Stereo Headphone Amp automatically detects connected signal paths and intelligently adapts for:

• Full stereo operation
• Mono operation
• Mono in stereo out configurations

Unused channels are automatically summed to the centre, ensuring smooth operation in any setup. Even when using mono instrument signals, AUX playback remains fully stereo through the headphone outputs for an immersive listening experience.

Ideal For Modern Live Monitoring

For live musicians using wired or wireless in ear monitoring systems, the Stereo Headphone Amp provides direct control over personal monitoring levels without relying entirely on venue monitor mixes.

By feeding a monitor mix into the AUX input while routing your own signal directly through the headphone outputs, players can achieve tighter timing, lower latency and greater personal control over their monitoring environment.

The selectable FULL and THRU output modes allow the AUX signal to be excluded from the main outputs when needed, making the unit highly adaptable for professional stage use.

Powerful Controls And Musical Saturation

The large Phones control adjusts the master headphone level and is large enough to operate easily by hand or foot during performance.

An independent Input Level control allows users to optimise gain staging for instruments, amp simulators or full pedalboard signal chains. Push the input harder for subtle analogue saturation and console style warmth, while the built in Clip LED provides visual feedback when levels become too hot.

Compact Utility With Boutique Quality

Hand built in Berlin, Germany, the Stereo Headphone Amp combines premium analogue circuitry with compact practicality and modern connectivity. Designed for pedalboards and studio setups alike, it provides enormous flexibility in a surprisingly compact footprint.

And yes, the illuminated KMA Bear eye looks fantastic too.

Specifications

Audio Features

• Stereo headphone amplifier
• Premium analogue high headroom circuitry
• High impedance input stage
• Analog buffered outputs
• Flexible stereo and mono routing

Controls

• Phones master level control
• Input Level control
• AUX and main signal Mix control
• Output mode selector

Connectivity

• Dual headphone outputs
• Stereo inputs
• Stereo outputs
• Bluetooth audio streaming
• 3.5mm stereo AUX input

Routing Options

• Stereo
• Mono
• Mono in stereo out
• Buffered thru mode
• Full mix mode

Additional Features

• Clip LED indicator
• Automatic input and output detection
• Suitable for IEM monitoring
• Pedalboard friendly format

Construction

• Made in Berlin, Germany

Power Requirements

• 9V DC power supply
• Centre negative
• 2.1mm connector
• Less than 250mA current draw
• Power supply not included