For sale due to equipment replacement. Non-smoking, no pets environment, only used indoors in a studio setting with minimal operating hours, so the unit is in very good condition. This is a fully functional unit, including the main unit, power cable, and original box. This listing is for the center unit shown in the photo. *Photos of the measurement results have also been added. The photos show the input and other settings at 5, a ratio of 4:1, with only dist2 on, and with only dist3 on. Even and odd harmonics can be clearly seen.