I looked the miniDSP boxes for my Bose 901 Series 1 EQ. Wound up buying an original EQ box which I gutted and re-stuffed with “Audiophile Grade” components and a big Toroidal with super low ESR caps filtered full wave rectifier. I heard that the return policy from Deer Creek is not so hot. Also, it’s inputs and outputs are RCA where I need XLR. A lot of people have been successful with their products from what I read on the various forums.