I guess what I am saying "IF" i get two EP500's would it be benificial to set up all four or would the Energy degrade the quality of sound
There will be some benefit. However, the larger subs will outplay the smaller one by a large margin. I had 1 EP600 and an 8" JBL sub.. The JBL was adding to the room, but you couldn't tell the damn thing was on, unless you put your head right next to it.. The 600 was THAT over powering... Now i have 600's and can say replacing the JBL with a second 600 did make a HUGE difference in my room. Depending on the size of the space you have i think two or more subs can be beneficial, even if they aren't the exact same size... If you go with a pair of 500's, those will over power your other stuff. But, your other subs will be adding to the room, and they're paid for; so, why not use them...?? :~)
