hi every one. i'm new here and looking for help with my nakamichi mb-75 i recently bought second hand. it have all power cables, atached amp and 2 RCA intputs, but have no "OUT" RCA conections. and want to plug two amps to it, one 4 chanel and one for sub. i'm looking for user manual (copy of pdf or link) or maybe some one can explain to me please. thank you very much in advance.