quick and cheap setup for localization experiment

[Massimo Grassi <massimo.grassi@xxxxxxxx>]

Dear all,

I've been asked by a doctor of the local hospital to organize a set of 
psychoacoustical tests for two teenagers that will receive the cochlear 
implant the next month.
The idea is to test the auditory skills before and after the implant. 
(Note that the girls will receive the implant in one ear only at the 
beginning.)

I was thinking also to get a measure of localization skills. And here 
come the questions:
1) can a lateralization experiment (i.e., performed with headphones) be 
a reliable estimate of localization skills?
2) does anybody have suggestions about a possible DIY, easy-to-build and 
cheap setup for a localization experiment? (pictures are welcome)

Thank you all in advance,
m