The AC-25 is a compact acoustic amplifier that runs from an internal rechargeable battery, giving about 4 hours of playing time away from mains power. It uses a 6.5" speaker and delivers 25 W. Two channels let a player connect an acoustic instrument and a dynamic microphone at the same time.

Sound shaping comes from amp modeling with two models: Stageman, based on the maker's own acoustic amp with a full low end and warm tone, and LBox, modeled on a well-known US acoustic amp for a transparent sound. Plate and Hall reverb are included, along with a built-in drum machine. The control panel is kept simple, and further settings can be adjusted in the Stageman app for iOS and Android.

Bluetooth carries both app control and audio streaming, so backing tracks can be played from a phone. An AUX input allows a wired source, and the amp has a headphone output and a line output. Input impedance is 1 M ohm on channel 1 and 2 k ohm on channel 2. A power adaptor is supplied.