TIP: keep checking the 'volume' in the application you are running and especially in the 'status bar' as many applications reset themselves to about 80% of maximum volume even when you recently upped it to 100%.
[e.g. the FM radio does this quite frequently]

[PS: when relaxing, for best stereo effect, I love to either put the n800 on the top of my chest just under my chin or if lying down on the beach in the nape of my neck - if you then additionally cup your hands around the n800 and your ears you will create quite an enhanced sound ]