TWO Rocktron XDC analog distortion rack units. They both work and pass audio. I tested them with a Bluetooth receiver, stereo DI box, and mixing board. They seem noisey to me. Could be my signal chain, could been my power source (regular power strip). My guess is to get them sounding optimal they would both need professional servicing. I haven't opened either chassis to look for problems. As Is sale, no refund.
Will ship fast via UPS ground in secure package!