This is a pretty stupid question, but I've always heard that you need a DTS DVD player to enjoy the DTS signal.
But now a friend of mine says that is enough to have DTS decoder on your amplifier as long as you use the digital output on your DVD.
In other words, will my non DTS dvd player play DTS signal on my soon to arrive 555es amplifier?

you got it, the decoder built in to dvd players is for recievers or TV's without a decoder.

It's not quite so simple... to get DTS sound, your receiver must support DTS decoding, but your DVD player must still be DTS compatible. DTS compatible players have a DTS logo on them.

Here's some information from the DVD FAQ at TheDigitalBits.com - [Link: thedigitalbits.com]

"... Because DTS was slow in releasing encoders and test discs, players made before mid 1998 (and many since) ignore DTS tracks. A few demo discs were created in 1997 by embedding DTS data into a PCM track (the same technique used with CDs and laserdiscs), and these are the only DTS DVD discs that work on all players. New DTS-compatible players arrived in mid 1998... DTS-compatible players carry an official 'DTS Digital Out' logo."

-Mike Newman

Thanks Mike, that's what I thought. Guess I'll have to buy a new player then.

Yup, I can confirm that my Sony DVP-S500D completely ignores DTS tracks. :-)