Maybe i wasn't realy explicit in what i asked.
I used library as3wavsound to play wav audio files. And i noticed that files with samples 11025,22050,44100 are played ok, but 8000 and 16000 not. Also i found an article where is written that Flex supports only the frequences wrote above, but i couldn't find this information on Adobe documentation.
Maybe someone knows if it is possible to play a wav file at fquency of 8 and 16 kHz and some examples maybe??