I have two receivers, 1 10 inch subwoofer, and 4 12 inch speakers that are Cerwin Vegas . Two black boxes are E 712 series. The brown box Cerwin Vegas has been re coned, when I bout them and top one brown boxes has a weird texture on top of the speaker box. Bought them like that, but they work well. Everything works, but I can’t get the subwoofer to work at the moment the light turns on but don’t heard the sound coming out of it and it also has an amp with the subwoofer. It worked the last time i had it set up. I haven’t used the system in a long time. I just bought the brown seven Vegas last year and I just had the black a very long time. I am the second owner the Black Cerwin Vegas. The black box has a little chips on it on the edges from being stored away for a very long time, but they still sound great . I bought one of the receivers brand new. Have a great day.. please text me. Don’t respond to the answers phone numbers that I don’t know sorry. I have them hook up so you can hear it.