It sounds like the question is: Can I connect two pairs of 8 ohm speakers and run them at the same time?
Sure - as long as the combined impedance of the speakers isn't too low and the volume you select isn't too high to cause too much current output demand on your modest amp and cause it to overheat. Most amps with a speaker select switch connect the speakers in parallel which drops the impedance (more difficult load for the ame) and requires more current output - so just be careful with the volume.
2-Ch (HT L/R): Oppo BDP-105 BD, Adcom GFP-750 pre, Bryston 10B Sub Xover, Bryston 4BSST2 / Paradigm Signature S4 v.2 (L/R), (2) SVS SB12-NSD (Subs)
Home Theater: Bryston 4BSST2 amp / Paradigm CC-590 (C), Outlaw 7700 amp / (4) Def Tech UIW-RSSII (LS/RS/LB/RB), Samsung 46” 3D LCD