Kma Audio Machines Stereo Headphone Amplifier

From ENDGAME to Essentials: KMA's Tool Dedicated to Stereo Monitoring

With the ENDGAME, KMA Machines set a benchmark for an "end-of-chain" tool designed for modern pedalboards. The STEREO HEADPHONE AMP carries on that spirit but goes straight to the point: offering high-quality, compact, and simple headphone monitoring while retaining what truly matters daily (AUX, Bluetooth, true stereo, versatile outputs). A solution tailored for those who want an efficient, affordable, and practical box without unnecessary complexity.

Who Is the STEREO HEADPHONE AMP For, and In What Situations Does It Make a Difference?

This model is aimed at all guitarists and bassists who play with headphones, from beginners to stage musicians. At home, it becomes an ideal companion for silent practice, working on arrangements via Bluetooth, or simply enjoying your stereo effects (ping-pong delays, wide reverbs, chorus) without losing the stereo image. In the studio, it serves as a reliable listening point after an amp sim, effects chain, or preamp. On stage, it can also help IEM users better manage their personal level: you can blend your signal with a monitor (via the AUX input) and regain control over your "more me" without disturbing the front-of-house mix.

Controls, Routing, and Connectivity: Simple to Use, Powerful in a Rig

The STEREO HEADPHONE AMP relies on direct and musical controls. The INPUT LEVEL adjustment lets you set the input gain according to what you send (instrument, pedal chain, amp sim), while a clip LED indicates if you are driving the input too hard. Tip: you can also deliberately push the input to achieve a "console"-style preamp saturation, ideal for slightly dirtying up a sound that's too clean. On the playback side, the AUX input accepts either a Bluetooth stream or an analog source via a 3.5 mm stereo mini-jack, then the MIX knob balances the blend between your main signal and the AUX. Finally, an output mode button lets you choose between FULL operation (AUX also present on main outputs) or THRU (AUX removed from main outputs), handy for listening to backing tracks on headphones without sending them to the PA, interface, or console.

"Premium Analog" Sound: Headroom, Clarity, and Breathing Stereo

No modeling or imposed coloration here: the STEREO HEADPHONE AMP is designed as a high-headroom analog tool, with a high-impedance input suited for guitar/bass rigs. The result: precise, dynamic headphone listening with a stable stereo image that respects the depth of your reverbs and the movement of your delays. The sound remains clean and detailed for clean tones, but the device can also become expressive if you push the input: the slight saturation possible adds natural compression and a very musical grain, useful for thickening a direct sound or giving character to an amp sim signal.

Technical specifications

Category	Powered pedalboard	Headphone output	Yes
Category	Amplifier	Color	Black
Number of channels	2

Flexible internal routing	full mix or buffered pass-thru outputs	Consumption	less than 250 mA at maximum load
Audio inputs	6.35mm Jack with auto TS/TRS detection (mono or stereo depending on wiring)	Product dimensions (H x W x D)	6.0 x 7.0 x 11.5 cm
Main outputs	6.35mm Jack with auto TS/TRS detection (mono or stereo depending on wiring)	Product weight	0.240 kg
Headphone outputs	dual headphone outputs with main level control	Box dimensions (H x W x D)	8.0 x 11.0 x 15.0 cm
AUX input	Bluetooth audio or analog 3.5 mm stereo mini-jack	Weight with packaging	0.320 kg
Output Mode button	FULL / THRU (manages AUX presence on main outputs)