I purchased the epic grand master with the QS8's souround and have a Yamaha rx v-750 receiver. On the back of the receiver there is a switch for 8 ohm speaker or higher which can be switched over to 6 ohm speaker or higher. Do I need to worry about this setting with the 6 ohm QS8's or just leave it where it is at 8 ohms. The receiver is 100watts x 7 by the way. Thanks.