I run several 2-channel systems and have multiple speakers in two of them that I listen to simultaneously (the speakers, not the systems). My favorite actually has three sets of speakers....ADS L-570s, an ancient pair of Genesis Physics 1s, and a pair of Totem mites. The amp is an Adcom GFA-555ii with a DH-110 preamp. The little Mites are the real secret in this mix, as they are somewhat laid-back/recessed to my ears, while the ADS and Genesis are really in your face comparatively. But the mixture works really well, no matter which two pair are being engaged at the time.
The other system is a B&K 125.2 amp/Cary Audio SL-100 combo, mated with Energy C-2s and a small pair of M&K K-5s that are floor-mounted at the base of the C-2 speaker stands. Both systems also employ powered subs.
The other system is a B&K 125.2 amp/Cary Audio SL-100 combo, mated with Energy C-2s and a small pair of M&K K-5s that are floor-mounted at the base of the C-2 speaker stands. Both systems also employ powered subs.