Well, just drop it where it looks best, for any input. This is the very reason that so many TVs old or new have a memory for different settings with different inputs. You can even calibrate them differently with Avia or whatever if you want. Of course, it blows if your TV doesn't have a memory feature and you have to do a recal every time you switch inputs, but that's life with and old/cheap TV.
3/7/14 at 10:50pm