Fender Acoustasonic Sfx Ii Acoustic Guitar Combo Amp Fender Acoustasonic SFX II Acoustic Guitar Combo Amp is the top of the Acoustasonic line. It's powered by 2x80W of power driving an 8" speaker, 6" speaker, and a piezo horn provides 2 channels (instrument and microphone) and features SFX (Stereo Field Expansion effect) and digital signal processing with effects select and level. Controls on the instrument channel include gain, treble, mid, bass, string dynamics, feedback notch, and phase reverse. The master section provides aux level, aux in RCA jacks, SFX level and disable switch, and master volume Connections include a footswitch jack, ground lift, XLR balanced line out with level, right insert/line out, left insert/line out, and a tuner out jack. 2x80W of power and driving - 8" speaker, 6" speaker, and a piezo horn