S510s are designed to be used in a line array configuration if desired. Try stacking your two see what it sounds like. I think you will be suprised.
Rel Line Array experience
I’m interested in hearing from anyone who has heard a Rel line array (S 510, specifically), or has one in his/her two channel system. I currently have a stereo pair and am thinking of upgrading by adding 2 more, or if the benefits are worth it, 4. What will the second or third stack add to my existing Treo CT’s? Thanks for any help.