I am not real good with audio specifics. My receiver is a marantz and has several different listening modes. I have two nice front bookshelf speakers and one subwoofer. Music sounds good on stereo mode but seems to sound better on Dolby PL. Does this sound right? Isn't dolby meant for multi channel? 3 channel? 5 channel? I am getting a center speaker soon. Do you guys prefer two channel music listening or three channel music listening?