Bit confused maybe someone else can shed more insight ... I recently emailed Rotel Europe asking if the RSP-1068 would accept/play the 640Kbps DD 'high bitstream' audiotrack or not via optical, and they replied as follows:
"Dolby specify that all standard DVD's with a 'Dolby Digital' track have to be encoded to provide 448Kbps. AC-3 standard maximum data rate is 640 kbit/s, however for standard DVDs the maximum data rate is 448 kbit/s. Some players can play higher-rate bitstreams but they are non-compliant with the standard DVD specification. You can try playing this disc with the higher data rate but the RSP-1068 is only able to decode 448 Kbps 'Dolby Digital' "
My testing, using an Oppo 971H and/or Onkyo DV939 as transports:
The Onkyo passes the 448Kbps track cleanly and Rotel plays it, but the Onkyo refuses to pass/play the higher bitstream track 2 and the Rotel sees nothing.
The Oppo passes the 448Kbps track cleanly and Rotel plays it, the Oppo passes the 640Kbps track cleanly and the Rotel also outputs audio again.
Perhaps the chipset is more forgiving than Rotel realise ?
"Dolby specify that all standard DVD's with a 'Dolby Digital' track have to be encoded to provide 448Kbps. AC-3 standard maximum data rate is 640 kbit/s, however for standard DVDs the maximum data rate is 448 kbit/s. Some players can play higher-rate bitstreams but they are non-compliant with the standard DVD specification. You can try playing this disc with the higher data rate but the RSP-1068 is only able to decode 448 Kbps 'Dolby Digital' "
My testing, using an Oppo 971H and/or Onkyo DV939 as transports:
The Onkyo passes the 448Kbps track cleanly and Rotel plays it, but the Onkyo refuses to pass/play the higher bitstream track 2 and the Rotel sees nothing.
The Oppo passes the 448Kbps track cleanly and Rotel plays it, the Oppo passes the 640Kbps track cleanly and the Rotel also outputs audio again.
Perhaps the chipset is more forgiving than Rotel realise ?
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