I purchased this unit around 2020 from a used instrument store, where it had been serviced. I primarily used it for electronic drums. Operation has been confirmed. There is some crackling in the volume knob, but it disappears after turning it a few times. The sound comes out clearly, but distortion may occur if the volume is turned up too high when used with a bass. Please use it at an appropriate volume. Headphones can also be connected. Suitable not only as a bass amplifier, but also for electronic drums and jazz guitars. It's versatile and can also be used for recording. Recommended for those looking for a bass amplifier for home practice. Spec Rated Output: 15W r.m.s. Terminals: High Input, Low Input, Rec Out, Headphone Out, Effect Send/Return Controls: Volume, Treble, Hi-Mid, Low-Mid, Bass Speaker: 1 x 25cm Speaker, 4Ω Power Consumption: 25W Power Supply: AC100V, 50/60Hz Dimensions: 456(W) x 390(H) x 242(D)mm Weight: 9.8kg