KMA Machines Stereo Headphone Amp

The Ultimate Freedom to Create — Anywhere, Anytime.

Following the massive success of the ENDGAME utility powerhouse, KMA Machines introduces the Stereo Headphone Amp. Designed for musicians who need the pristine audio quality and flexible routing of the ENDGAME's headphone stage without the extra bulk, this compact Berlin-built box is the "Infinity Stone" your pedalboard has been waiting for.

Hear Your Rig in "Ear-Gasmic" Stereo

Whether you are practicing silent late-night sessions or need a reliable wired IEM solution for the stage, this device delivers premium analog audio with massive headroom. It automatically detects Mono or Stereo TS/TRS connections, ensuring your "divine" stereo reverbs and delays are heard exactly as intended.

Total Connectivity: Bluetooth & Analog Aux-In

Integrating backing tracks or samples has never been easier. With built-in Bluetooth and a 3.5 mm Stereo Analog Aux-In, you can stream audio from your phone or computer directly into your mix. Use the dedicated Mix/Blend Control to find the perfect balance between your instrument and your playback.

Built for the Modern Performer

• Dual Headphone Outputs: Share the mix with a bandmate or teacher.
• Wired IEM Solution: Avoid digital latency from monitor desks by blending your own "more me" signal via the Aux-In.
• Foot-Adjustable Control: The oversized Phones Control knob is large enough to be adjusted with your foot during a performance.
• Analog Character: The Input Level control features a Clip LED; push it hard for a musical, saturated "pushed console" vibe.

Flexible Signal Routing

Switch between Full (Aux included in Main Outs) and Thru (Aux removed from Main Outs) modes. In Thru mode, the device acts as a high-quality buffered stereo output for your rig, sending only your clean signal to the PA or interface while you keep the backing tracks in your ears.

Main Features

• Audio Quality: Premium Analog with high-impedance input circuitry
• I/O: Auto-detecting 6.35 mm TS/TRS (Mono or Stereo)
• Aux Input: Bluetooth Audio or 3.5 mm Stereo Analog Jack
• Outputs: Dual 3.5 mm Headphone Outs + Stereo Main Outs
• Routing Modes: Full Mix or Buffered Thru (removes Aux from Main Outs)
• Power: 9 V DC (centre negative, 250 mA)
• Origin: Handmade in Berlin, Germany