TNTguy,

I have the 2805. The auto/manual room equalization is used to set up your speakers. The 2805 comes with a mic that you place at your listening spot. You run the auto and the receiver automatically calibrates your speakers. I used this feature and it worked great. The audio signal delay allows you to adjust the sound to your video. Sometimes the audio on certain displays is out of sinc with the picture. You can adjust the delay with the Denon receiver to eliminate that delay.

Scott