High quality 4 Channel Preamp with Lundahl LL1517 output transformers. This unit has seen light use in a home studio for the last two years and is still in fantastic condition. It's built very solidly and all the toggle switches and knobs are still good as new. I've had amazing results recording drums through it as well as acoustic instruments and vocals and found it to be a huge step up from the stock pre's in my interfaces! Selling because I just reconfigured my setup and no longer need as many channels.