Heya,
Typo on my part, they're the AV40's, edited to reflect that. I like them. They're very detailed and pretty accurate little monitors. I got them because they can travel. They're self powered so I can literally just plug them into the wall at a friend's house, my Sansa Fuze outputs to them and voila, music on the go for more than one person. I use them when I'm not doing any particular listening on headphones for basic tasky stuff, like browsing, youtube, etc. Which means they're rarely on, since I 99% wear headphones when listening to music. Again, I mainly take them with me to places to setup a portable music station essentially (Sansa Fuze + AV40's).
The PRO 900's were glorious with bass. But, they were not my favorite headphone for acoustic & female vocals which I listen to a lot as well. I recently went with the HE-500, which is actually quite bassy for an open-headphone, and it more than covers my bass needs, while still having the generous mids and highs of something more like the SRH940. I had been looking for a headphone that basically combined the strength of the SRH940 and the PRO900 into one phone, and found it in the HE-500. So, sold off my mid-tier headphones immediately. Last one ships out today, the PRO 900. And actually will be selling the Little Dot MK III seen there in the photo soon too as I have no use for it anymore.
Very best,