with regards to the acoustics, over the years I've been to a few games at the arena, (though usually against lesser clubs as it was on my flat mate's season ticket and he would go to the big games). my experience is that it depends where you sit. when I would sit 2nd tear halfway line, you could sometimes hear peoples non shouted conversations several rows behind you, typical library game (only time I've been to a quieter game was at Wimbledon when they were ground sharing with the with those people whom you've never seen in the Dam). however, when I've sat near the F Side (like I was last night) the noise is much louder. weird thing is, I used to live in Diemen when they played in de Meer, and you could hear them roar when they were playing from a few miles away. I don't think it's the fans, from my limited experience and zero knowledge of how sound works, I think it's the acoustics.