How are the highs on the m80 with the 2 titanium tweeters? Does it ever get too harsh? I'll be pairing these with the VP100 (because of it's size). How will the m60/80 match this center?

Also, a question about subs. I notice the EP350 is the only sub listed as not having Balanced Line In and Out. What does this mean and how does it effect the sound?

Thanks.