Hi guys! Our house already has 2 Klipsch Reference 25 floorstand speakers. Can I use it to go along with my Onkyo 606 receiver and 5.1 Polk RM-6750 speaker set-up to get 7.1 out of them? I would use the Klipsch RF25 as the front L and R speakers. I dont know if it is okay to mix and match speakers though so I wouldnt want to do it without you guys opinion on it.