Subwoofer question #2

[Z3r0]

Hey its me again , This fits in both cables and speakers so i decided to put it here but ne way...

I was looking for a cable for my subwoofer and i came across this review for 1 at circuit city:

One of the cheapest sub cables monster makes. Comes with y-connector if you would like to connect to both left and right inputs on sub(which most people do).Does the job

I was unaware that the sub had left and right inputs? Plz clarify Do all subs have left and right inputs? Is it better to use both or one? thank you!

I also have another question, I am going ot buy this sub:

http://www.bestbuy.com/site/olspage....5&type=product

It says it has high and low lvl imput options, what does that mean? With the y connecter will i be able to use both of them? Thanks