These work great and sound absolutely incredible - warm, huge, punchy, very pleasant. They've been my go-to preamps for a few years now, very sad to sell. Each channel has 48v, pad, stepped input and output gain, and a flow knob which is like another input gain stage, so you can overdrive them if you like.Although they look messy they sound incredible, and i've never had any issues with them. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "phartunian" and is located in this country: US. This item can be shipped to United States.