www.electrovoice.com/product.php?id=60 I have a EV AC_ONE that is in great shape. I used it on my T-series speakers and my qrx115/75 over Qrx 218's. It's simple/works great and sounds great. Gives you the punch. It is designed for a two way system. Full range-two way tops and subs. Will work with any brand speakers. It is made by Dynacord. Only reason I'm selling it is I bought a pair of qrx 212's to go with my 218's and bought a DC-One. I really don't know what to ask for it. Shoot me a fair price. It works great!