Two amplifiers means two power supplies. But a single 5-channel, assuming its a quality product, will have an adequate power supply anyway. Generally speaking, neither approach will 'sound better', even though both have been suggested as being sonically superior in this thread. I usually prefer multiple amps though, as it is easier to upgrade down the road if you decide to change speakers. For example, if you decide later you want to run two massive subs that require more power than your 5th channel of your amp allows, you dont have to purchase new amplification for your entire system.