Power Cord Question

Ok, call me a simpleton, call me whatever you'd like, but I have a seemingly stupid question for you ppl out there in Audiogonland...

I bought an inexpensive subwoofer (Energy ESW-V8), which i got for cost (else I likely would not have purchased it), and it sounds surprisingly good (I'm still kind of in shock at that). It shows good bass note delineation, integrates well w/ my mains, goes down quite low in frequency and does not sound overly bloated and/ or as though it's playing only one note. Good value, for sure. Frankly speaking, it blows away the M&K sub I used to own a few years ago (and I thought M&K was touted as the be all and end all of subs at that time).

The Energy sub came w/ a detachable power cord and since I've read a lot about how power cords can affect a given component's performance, thought I might try a couple of different ones just for shits and giggles.

The cord itself is a two-prong. I have several other power cords kicking about, including computer power cords. All of these power cords are heavier guage than the Sub's original cord, which is good, however they are all three-prong cords.

After all this rambling, I just want to know if it's safe to use a three prong cord in place of a two-prong cord. Since I have less than rudimentary knowledge about this, i've turned to you, my trusted audiophile crazies, to answer this (stupid) question.

(hey, my mother always told me there's no such thing as a stupid question! ;) )

thanks in advance!