I've upgrade my ECI-5 (Old model) with EC-4.8 Pre-Amp and AW-180 Mono-Block Power Amp a few weeks ago. Right now I plug my EC-4.8 and Esoteric CDP into a CSE TX-1200 Isolation Transformer, and the Power amp AW-180 are connected directly with the Furutech GTX-D(R) receptacles wall socket. I'm very happy of the sound quality improvement, almost completely another world.