AshBuchanan, I experienced a similar problem last night!
I've had a Marantz SR7013 AVR for just a few days to replace my old Yamaha and noticed the following last night:
1. It wouldn't play most of my 4.0 FLACs/DSFs (e.g., Best of the Doors, Pink Floyd - Wish You Were Here, etc). Nothing. Just the sounds of silence, Simon and Garfunkel-styles.
2. It would play only a handful of my 4.0 FLACs/DSFs (e.g., Best of the Doobies, Poco - Seven/Cantamos).
3. It would play the original 4.0 SACDs/BDs/DVD-As/DVD-Vs that I ripped the FLACs/DSFs from which suggests that it's the Marantz's lack of recognising a 4.0 FLAC that's the problem.
4. It wouldn't play Andy Jackson's Signal to Noise 4.0 DVD-A at all.
5. I thought adding a silent centre channel might solve it and this thread confirmed it. I opened a 4.0 FLAC in Audacity, added a new track that will be the silent centre, moved it so it's under the left/right tracks and above the 2 surround tracks, exported it and it now plays correctly!
Now I need to figure out how to convert my DSFs to FLACs so I can do the same process in number 5 above with Audacity. I see that some QQers have used Foobar to do this DSF-to-FLAC conversion but when I downloaded Foobar, added the converter packs, it still doesn't recognise the DSF when I right-click to try and convert it.
Is anyone able to help me with how to get Foobar to convert DSF to FLAC?
Anyone? Bueller?