I use balanced XLR cables between my 990 and ATI 2005 (OEM's version of the Outlaw 7500) but there has been great debate whether (not to contradict FAUguy) there is an audible difference between balanced and unbalanced cables for the typically short runs between a pre/pro and the amp. I like the positive "snap" of the XLR connectors and the cost between cables was not that great so I went balanced. If I was trying to make a decision on an amp I'd be more concerned about getting the right amount of power (other posters have opined the 7125 is enough for your current speakers) versus whether the amp had balanced connections or not. However, if the amp is going to be some distance away from the pre/pro and you know you have a noisy electrical environment balanced cables/amp could be a benefit.