I was wondering if anyone could help me to get the best sound results from a system whenever I use a 2.0 input source. I have a standard 5 speaker and 1 sub system, the receiver is a Sony STR-K402 to be exact. I have a device that gives only output in stereo using a headphone type (mini plug?)jack. No RCA, optical or coaxial outputs in the device. So when I listen to the sound from that source, in "normal surround" mode I get mainly the center channel doing everything. No activity from the rear channels or sub. In the "digital cinema sound" modes I get alot more activity from the left and right channels. Still nothing in the rear or from the sub. My question is can I somehow get the system to have any activity from at least the subwoofer? I have the small type speakers so use of the sub is definitely needed. I'm wondering if perhaps I have it hooked up incorrectly since I am using a standard mini-plug to RCA jack adapter, then a 1 to 2 plug RCA Y-connection going to the 2 RCA cables. Is there a better adapter that may translate the stereo mini-plug output directly into a double RCA output? I think a big problem is that I'm most likely getting mono sound with the way it's hooked up. Any help at all on this one? I know it sounds kind of whacked but the basic idea is that I want to connect a device which only has a mini-plug output to my home theater system and get as good of sound as possible from it.