I perfectly understand need for good audio engineer in rock concert. But I still can't see any good reason for EQ in mobile device. When your on train, an airplane or some other place where there are some background noise it's almost impossible to fix anything with EQ even if it's good one. Background noise changes little bit for every place and you would need to change settings for every place where you are listening music. Having reasonably well isolating headphones makes music on those situations much more enjoyable at least for me than any EQ could ever make. This is not possible for all of course as some can't use in ear headphones.

I must admit that last time I have used any device with an EQ was circa 2000 with some Sony mini-disc player so I don't have a clue about the todays best devices with EQ. Sound when EQ was enabled on that mini-disc sounded almost in all cases too unnatural to my ears, even when the changes were very small. I want to consume my music as close to that as it sounds in CD when played on studio and EQ haven't provided it to me.

One other reason I'm against EQ on mobile devises is because I have seen too many people using it just too heavy settings and then sound is not even close to that what it sounded in the studio. Then these kids go to some music forum to say that and that CD sounds very bad even if the CD was extremely professionally made and and sound is excellent (like the music itself which is the most important). And when there are too many of those kids it comes a truth in the Internet and band don't sell as many CDs as it might have sold with correct information. Thats one reason I don't go any more to music sites to see if some album is good buy or not.

But back to N900 and sound quality I still think that N900 sounds really good and I can even say that it's one of the best sounding mobile devices you can have this year. There is also one big advantage to some other devices that you can put microSD card in this device, so yo can have very big music catalog with you. I still need to do some more testing with MP3s and FLACs to see if I need to move completely FLAC. On quick tests I have heard (or so I think ) more details in FLAC files than MP3s. If thats a case I need to buy pack of cards to get all my music with me while I'm on the road.

If some one is interested to have good compromise with file size and audio quality I can recommend following settings for Sound Juicer in Linux:
And as you can see these are my personal thoughts and should not be taken as only truth . I promise that I don't throw more gasoline in the flames .