The Acoustasonic 15 is a small solid-state combo amplifier built for acoustic guitar and a microphone. It has two channels, one for an instrument and one for a mic, each with its own volume control. The instrument channel adds bass, middle and treble controls plus a chorus, while the microphone channel has bass, middle and treble controls.

The 6-inch Fender Special Design speaker uses a whizzer cone, a small supplementary cone attached to the voice coil, to give a more effective high-frequency response. Fender describes it as the only one of its guitar amps to use this design. The 15 W output drives a 4 ohm load.

The front panel has a 1/4" input for an instrument and an XLR input for a microphone, and a headphone output is included. The cabinet is 5-ply lightweight plywood covered in brown textured vinyl, with a black grille cloth, a red LED jewel and a molded plastic strap handle. It weighs 4.76 kg. The EU version runs on 230 V mains.