i have not heard the ep500...but...i will tell ya that there is no way a servo 15 from paradigm could compete with 2 HSU vtf3's...that is for sure. i HAVE heard those, and there is just no comparison. i still can't believe that they are only 12" subs!!! also, my buddy is gettin the turbos for these subs, so they will get better still!!! and as for ONE sub compared to TWO..i would ALWAYS go with 2 if you can afford it...and that is the general recommendation of almost all speaker manufacturers...2 subs is the way to go for sure
