◯ Product Information CLASSIC PRO power amplifier CPX4100. Product dimensions (length x width x height): 27 x 48.2 x 8.8 cm 4-channel adjustable rack-mount power amplifier. - Power cable: Included - Knobs: Volume adjustment knobs ◯ Condition of the product Junk item Power on confirmed It seems there is a problem with CH4. There are some scratches on the top panel, but the exterior is in very good condition. Usage frequency and purchase date are unknown. Please understand that this is a junk item and purchase it if you have knowledge of repair or parts replacement. We will pack it properly using bubble wrap, etc., for shipping.