I'm debating tearing out all the electronics from my Play 3 and replacing them with an aftermarket amp + Chromecast audio. My only concern is the “2.1” nature of the system. The Play 5 appears to be a “Mid-Mid-High” mix and most COTS 2.1 amplifiers are “Mid-Mid-Low” Any thoughts on how to power only the speakers with a COTS amplifier?