No, not no matter what. You will need an RF demodulator if you want to hear Dolby Digital 5.1 sound from laserdiscs. If you don't have an RF demodulator, you can still listen to the Dolby Pro-Logic Surround (happy, Paff?), which many think sounds just as good, if not better than Dolby Digital 5.1. I'm not one of those people, but I can't say I've done back to back comparisons. Dolby 5.1 goes from LD player to RF demodulator and then into your receiver. Technically it isn't Dolby 5.1 until it's processed by the demodulator, but lets not get too technical here. DTS is a whole different game. If your LD player has Digital/PCM output and your receiver has the appropriate (coax or optical) input, then you're all set. DTS LDs are SWEEEEET! Digital Out is fine for DTS and Dolby Surround. You need an AC-3 RF Output to get the Dolby Digital off a laser (and then feed it into the demodulator and into the receiver from there).