I have my tv conected to my hi fi amp via phono leads from the back of the tv, this gives me decent sound through my hi fi, would I notice anything if I added a dac between the tv and the hi fi. thanks.
If your TV has an optical out, it's possible. I'd be wary of introducing lipsync errors though, because without an AV amp or Bluray player in between equipped to alter that time delay, it might be very noticeable.
I use a DAC using the digital out from my cable TV box, with another input from my DVD player. The sound is much better but I only bother using it for films etc, very slight delay between TV sound (if I leave the volume up) and dac, but certainly not enough to cause any lip synch issues