I'm having an issue with my headphone jack output on my N900...
When I use my Shure SE530 or BlackBerry headphones the output doesn't sound right. The left side is like a left speaker and the right acts as a center channel. Everyone's voice is through the right and music/sounds are through the left. This doesn't happen with the N900 headphones. Is there an application that I can download that will set the N900 to play everything in stereo through the headphones or something?
I use Sennheiser earplugs and I can't complain. I'm very hi-fi with my music equipment, so I think you might have a slightly faulty unit.
That, or then it just happens that your BlackBerry and Shure earphones are both broken :/ I think the stock N900 earphones are so rubbish, that you can't really hear anything clear through them, thus possibly "masking" the problem. :P
The Shure headphones work perfectly fine in my iPod and Blackberry. It sounds like the N900 is trying to output a surround signal rather than a stereo one...
I think the N900 has surround as default, this works amazing on headphones, but in earphones it suck. (using Sennheiser HD280 headphones, and some Sennheiser earphones)