I use a second electronics system, amp and pre-amp, to drive my excellent mains and quality subs. Since both sets are driven by thr same models of amps and pre-amps, and since I measured and time aligned all of my speakers, it works great. an added benefit is complete control of how much bass is either added, either to somewhat suppeiment my mains, or really rock out. On really good recordings, the volume controls are set the same. .