I finally replaced JBL 2123Js with Eminence Delta 10As and added resistors and inductors to the crossover boards so that the crossovers are exactly the same as specified by Wayne's plan and connected the speakers according to Wayne's plan as well. I discovered that I have to move my seat 2 feet and maybe and half further away from the front wall to get a much larger sweet spot. The sound is more relaxed than before which I like a lot. Maybe this is what Wayne meant when describing the corner horn sound with Delta 10 as creamy?