I recently bought Toshiba's new SD4800 DVD player, which has six-channel output for DVD-Audio discs. I am using it with my Yamaha RX-V2200 A/V receiver, which has a six-channel input as well as both coaxial and optical inputs. My only DVD-Audio disc so far is EMI Classics "20th Century Symphonic Sound, Ingo Metzmacher, Philharmoniches Staastsorchester Hamburg (which is labelled DVD Audio/Video, though the only video on it is still pictures and text). On the back of the disc it states DVD Audio/Video 5 NTSC; DVD Audio: PCM Surround 5.1 (48kHz/24 bit) - PCM Stereo (48 kHz/24 bit); DVD Video: DTS Surround 5.1 AC3 Stereo. My problem is this: on-screen it shows I can play either DTS 5.1 Surround or DD 2-channel stereo. If I set-up according to directions for the coaxial input (choosing multi-channel settings), I get excellent reproduction in either the DTS or DD, but if I activate my receiver's 6-channel input, there is no sound. If, on the other hand, I choose the connections for the 6-channel input, I get no sound either. And if I disconnect the digital input and use only the 6-channel input, I also get no sound. I can get sound at low volume and without bass management by playing either an ordinary CD or DVD Video film using the 6-channel input, but I am wondering whether there is something wrong with this disc: is it a true DVD-Audio disc, and if so, how can I play it properly?