Washburn produced the EAC12B-A-U as part of its Festival Series, positioning it as a mini jumbo cutaway acoustic-electric guitar within that line. The cutaway body configuration and onboard electronics made it suitable for amplified performance, while the mini jumbo sizing offered a compact alternative to a full-sized jumbo body.

The model was finished in black. As a 12-string instrument, it carries the characteristic doubled-course stringing that produces the fuller, chorus-like tone associated with that format. The acoustic-electric designation confirms factory-installed pickup or preamp electronics, though the specific electronics components are not detailed in the available source material.

Owners requiring setup adjustments, nut or saddle work, or guidance on string gauge selection for a 12-string acoustic-electric should consult a qualified guitar technician familiar with 12-string instruments, as neck relief and action on doubled-course guitars can require more precise calibration than on six-string models.