[Tunksy31]

Rather than worrying about impedance and wiring in series or parallel just pick up a cheap 4 zone speaker selector. Majority of them now a days are impedance matching and are set at 8ohms thus appearing to the amp as an 8ohm load. As long as you aren't trying to power multiple pairs of floor standing speakers and aren't blasting the room every night you will not "stress" out the amp to the point of failure.