Ok, here's the situation. I just bought a Kenwood AVR-406 receiver, it has built in Dolby Digital and the website claimed it also was able to play DTS via a DTS decoder. Now I have a Sony DVD player that has a DD decoder and a DTS decoder built in. My dvd player has a coaxial, optical, and six outputs. I'm using the coaxial connection for DD which works fine, but I tried one of my DTS discs the other night and I didn't hear any sound.
Am I using the wrong connection to get DTS? and is the decoder in the dvd player cosidered a decoder for DTS, or do I need to get one of those external decoders that cost about 200 bucks? Thanks in advance.

It sounds like you're still sending a digital signal to your receiver via the coax digital output. The receiver is then going to process that, and since it doesn't have DTS decoding, you're not going to hear anything during DTS playback.

I'm not positive, but I'm guessing that you'd have to use the 6 channel analog outputs connected to a 6 channel input if you're going to use the DVD player's internal DTS decoder.

Anyone else have an idea?

Are you sure your DVD player has a DTS decoder. As far as I know there are some DVD players that do have a built in DD5.1 decoder, but none of them actually decode DTS but just pass ir through. None of the current Sony players have a DTS decoder built in although the S330D, S530D and one other model do have built in DD5.1 decoders. You still need a receiver that will decode the DTs signal passed by the DVD player and it looks like you receiver is DTS ready but does not have a built in DTS decoder. If it is DTS ready then it still needs an external DTS decoder that connects to the the six channel inputs on the back of the receiver.

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Yup with my receiver I have to hook up the DTS output to analog multichannel input on my receiver. But my DVD player does not have DTS decoder. So no DTS for me.