I found some people are unclear as to certain values in surrounder. I will explain these settings as I have come to understand them. Speaker Mode: Set to speakers you have. e.g 2.0, 4.1, 5.1..etc. Surround: On...Enables balancing of surround parameters. Surround: Off...Disables surround sound. Surround: Copy....Allow Rear front and rear channels to receive same signal. VCenterA: The Amount of signal to the CENTER channel on a 5.1 system. VRearA: The Amount of signal to the REAR channels. VRearW: The Width of your REAR channels. VRearD: The Amount of signal Delay between front and rear channels. Use Subwoofer: Enables Discrete subwoofer output, if you have one. Enable Bass Redirection: Enables crossover frequency adjustment for the subwoofer channel. Split Freq: The Frequency (Hz) at which crossover starts to filter signals to subwoofer channel. Change your settings to get best possible surround sound imaging. Use Bass Redirection and split freq to get the most natural sounding bass response. Of course you just set them to what sounds good on your system in your space to you. Hope that helps.