Some receivers automatically cut the speakers when you plug in the phones. If not, you should have a button/switch to turn off the speakers.
I have a sony str-de545. I'm trying to use the receivers headphone jack to listen to games while i'm playing my gamecube. I have the red and white audio plugs connected to the tv/sat audio in jacks in the back of the receiver going to the audio jacks in the back of my tv. The problem is that I don't want sound coming out of my tv speakers when I have the headphones plugged into the receiver. Help. Thank you.