I have an onkyo htr-540 receiver. From what I can tell it is rated for 8 ohms. I found my old speakers from an old htib I used to own- the RCA rt2500. The back of the speakers say 6 ohms. Basically want to know if I'll break something or set a fire if I use them together. My logitech surround system died on my PC so gonna replace it with the above if it will work vs buying all new stuff. Thanks guys.