So I've got an outdated reciever and speakers for 5.1. Because my RCA RT2500 is so old, it cannot decode 5.1 audio when I'm connected to an optical cable, which is what I connect to my Blu-ray player. So I got an "external 5.1 decoder". I watched a movie and it sounded fine and audio was coming out of all channels. But when I used the DTS Sound Check on my Pulp Fiction Blu-ray, something was off. When audio was supposed to be from a single speaker, audio was coming out of all of my speakers. So know I think this decoder might be creating or up-mixing a fake surround mix. My reciever was directly connected to the decoder, no dolby pro logic being used. I just want to know if I'm hearing real 5.1 because the decoder claims to support DTS, which I was using. The decoder is called "HD Audio Rush" by the way. Any help is appreciated and I hope I can soon get this figured out because I don't know when I will be able to upgrade to a decent reciever.