The Importance of Room Interaction

[Wireworm5]

Recently I purchased the Pulse dvd, I already have the Pulse cd for comparison. Using 640 kbps Dolby Digital and the song 'Comfortably Numb', on first spin of dvd I had the volume matched low to what I usually play the cd at. Although the dvd has much more resolution at this volume, the guitar on this song did not have the siren effect that I have grown acustom to on the cd.
Today I played the dvd again at approx.95 decibels 'A' weighted 105 'C' weighted and there it was, the siren effect. I attribute this to sound interaction with the room at this high volume. Also at this volume I find directionality of the speakers less obvious.
I realize of coarse that not everyone can crank their stereo this loud and your room acoustics will be different than mind. But for me I like music at a higher volume just for the room effect which is similar to how I recall a Live concert sounding at our auditorium.