watching dvd w subwoofer


I want to connect a subwoofer to my TV or dvd player to watch dvds. Which do I connect to? Is there a difference?
samuellaudio
If you connect the sub to the DVD player, you will not be able to control the sub's volume unless the player has it's own volume control
my tv has a subwoofer jack, manual says I can use a mono cable to the sub. Can I do this just to watch TV?
mt tv has 1 input jack, but sub has 2 input and output. why does sub have 2 (left and right?)