Have you looked at ShareCG?

http://www.sharecg.com/v/16846/View/5/3D-Model/headphones-prop

http://www.sharecg.com/v/43157/View/11/Poser/Headphones-for-Aiko-4-Smartprop

http://www.free3dmodelz.com/3d-accessories/3d-headphones/

http://www.turbosquid.com/FullPreview/Index.cfm/ID/548392

 

Object files can be imported into Poser.  Go to "File" and then "Import" and pick "Wavefront Object"

If you find .3ds Max files, those can also be imported.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi