My Yamaha RX-V1400 has a "7-channel stereo" mode the sends the same signal at the same loudness to all speakers. I rarely use it.
If using regular surround mode, and if you're receiving Dolby 5.1 information from the player, most of the sound usually comes from the center and main speakers.
Check the manual for your receiver and player. Check the indicator lights or status readout on your receiver to ensure it's getting Digital Dolby 5.1 data from the player. Verify the player is connected to the receiver via an optical or coaxial digital signal cable. If the receiver isn't getting DD 5.1 from the player, go into the player menu system to ensure Digital Dolby output is enabled. Sometimes it's disabled.
