I have a onkyo TX-SR503 receiver, running cerwin vega VE-12 fronts and ve series surrounds and centre. On the back of the speakers it has "compatable with receivers rated 8 ohms or less". the onkyo has a setting to choose between 4 ohm and 6 ohm impendence, and i am wondering which would be best for the receiver? would it make any difference? i have it set at 6 ohms currently. Thanks alot for any advice, i love this site. !!!!!!!!!!!!!!!