5.1 channel audio

[WHITETRASH]

I was using the optical out on my bd-p1400 until I heard I could experience Dolby TrueHD using the analog outs. I tried this and was pleased with the sound with one major problem. The subwoofer is barely getting a signal. When I use the optical you can feel air on your hand from the sub over a foot away, but with the 6 channel mode you can't even tell its playing. What didi I do wrong? My reciever is an older RCA R2250???(not sure about model#) that has dd and dts decoders. I want to use Dolby True HD but not at the expense of no bass.