I have been gifted some DVD audio discs, which don't seem to want to play on my 800 machines there a special setting, or could it be they are different regions perhaps, any ideas

LP12, Garrard 401, Thorens TD 125, Tom Fletcher DAIS, Thorens Td 150, Systemdeck. 800v2, DSP 6K's 18 bit.
Leak TL12+ Monooblocks.Quad ESL 57,Jim Rodgers JR 149