Well, if the recordings were made in one of the new high-res formats like DTS HD Master Audio format you won't get it through the PS DAC3. If your Blu-ray player is a good one you can hook up either the analog multi-channel or stereo outputs directly to your preamp and get the higher resolution that way. If the Blu-ray player is not so good the PS DAC3 might still sound better but you might want to compare and see.
If the Blu-ray lacks analog outputs and only has an HDMI output then there might not be much you can do other than buying a better Blu-ray player or a digital processor that provides the new high-res formats via HDMI input. But you won't be able to get the newer formats over S/PDIF coax or TosLink optical.
If the Blu-ray lacks analog outputs and only has an HDMI output then there might not be much you can do other than buying a better Blu-ray player or a digital processor that provides the new high-res formats via HDMI input. But you won't be able to get the newer formats over S/PDIF coax or TosLink optical.