I have a EAD Signature and my friend has the Meridian 565 both models are older but we both agree the EAD is more musical 2 channel than the meridian equipment, and the Meridian is more flexible with channel management and bass management than the EAD... So depending on how many subs and whether your speakers aren't full range the meridian can provide additional flexibilty but setup is definitely more complex than the easy sit with a mic and let the EAD calibrate itself. I would probably look at upgrading your other components before making that change as both of these are stellar...
