The [ACS1] is an amplifier and speaker cab simulator delivering the sound and feel of world-class amplifiers, complimentary speaker cabinets, and controllable room size. With the ACS1, players have expansive options to deliver their tone whether it s on stage, in the studio, or practicing at home. Simple controls, stereo in and out, onboard presets, and MIDI support make the ACS1 an immeasurable tool in a guitarists arsenal. Amp + cab simulator. 3 built-in & 3 user loadable cab IRs - mix and match on left & right. 3 classic amp models - mix and match on left & right. Save and recall 3 onboard presets and up to 128 via MIDI. Stereo in and out. USB jack for firmware updating and IR loading. Headphone output for bedroom practice. Built on our powerful Mako platform with Analog Devices SHARC processor. 9-volt DC, Center Negative, 300mA minimum. Made in USA.