I am putting my bass to passive. http://www.audereaudio.com/Scripts/prodView.asp?idproduct=5 You can go the audere site and check it out. But most of you know what this is. Config is Vol, Mid,Bal stack, High/Bass Stack. Preamp is in excellent condition, super easy to install. If I can do it, you can do it, too .. haha $110 paypal shipped. I can ship today via USPS priority mail. thanks. By the way, i don't have installation paper, but you can download from audere website.