Right now my main speakers are 4 ohm. I have a Sony 900ES so I have the 4/8 ohm switch set to 4. I have been looking at new receivers and only Sony and JVC offer the 4/8 ohm switch. Will I harm the speakers if I purchase a receiver that runs at 8 ohms? The speakers will be replaced in the future but I'd hate to send then to any early death. Thanks for the info and the previous help.