I am planning on a Scan 6000/12M/18W/23W system. I notice a lot of forumers here use 23W. Based on your expereices, is one 23W sufficient enough or do I need to do 2x23W? My monoblock amp will be an Audison LRx 1.1k which is rated at 420w @ 4 Ohm and 800w @ 2 Ohm.