I have a 95 sc300 w/Nakamichi system. I was using a cassette adapter for my I phone player and everybody says that Auxing the signal would give much better sound then the adapter so I went to work on that. Since it's a Nak system I had to Hijack the CD changer signal. When I was done I discovered that the power coming in from the CD input was maybe a third of the power from the cassette adapter. I went online and found a preamp for I phones called Boostaroo Revolution that stated it would increase the output of your phone upto 400%. Just so others know if you're planning something similar, it increases your power by MAYBE 40% not 400. Don't get me wrong, the sound quality is much better but I like my rock loud!