[QUOTE=thomm;2564971]on some movies it will show 2 audio streams both are english ac3/6 if i uncheck either one the quality goes up do i need both streams thanks[/QUOTE]
It depends on your own priorities and what the other audio stream is for.
Most likely it’s director’s commentary or something similar.
Whether this is worth keeping or not depends on what you’d like.
If compression isn’t required I usually leave things the way they are but if it is required I usually only keep the main audio as quality is my primary concern.