So, you have the player hooked to the TV or the receiver with optical? Sounds like you went to the receiver with the optical, which would be correct, however you also may have to switch the player to bitstream instead of LPCM, and make sure DTS is enabled. These may not be on my default for the SPDIF connection. You also need to make sure the player is set to output audio via optical rather than HDMI, since you have both connected.
I guess we all need to slow down and do our home work.
His processor is an old
Dolby pro logic unit from 1991!
For anything other than two channel operation it is useless. It has no codecs and no bass management.
His power amps are 200 watt mono blocks.
So that processor is useless for multi channel audio. Also it is only standard definition video with only composite and s-video inputs and outputs.
So in the context of modern AV that processor is has to be junked. It is only of any use as a 2.0 audio preamp at this time.
His DVD must have been outputting 2 channel.
So he can only use this unit with the players set to output 2 channel LPCM I suspect, as that is what was around back then.
His power amps are fine.
If he wants to play BD and DVD in HD and discrete multichannel audio, then that processor has to go.
He needs to get a receiver with preouts and connect his power amps to power his left and right front speakers. He needs to use the receiver to power the center and surrounds. He should also get a sub woofer.