[speex-dev] compression rate

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Hi, 
I am very fresh man at CODEC part..
I wanna know SPEEX's compression rate..
to say , I tested wav file at 8000 Hz, 8bits to spx file.. I hoped 1/16 compression rate more..
but,, the result was not good for me..  
to say example..  I made wav file of 254Kb at 8000Hz , 8bits ...and then encode that file..
the result was that spx file of 33.7Kb  is made... so, I though that compression rate is 33.7 / 254 .. about 1/8..
and,,, there was noise in decoded file...
of course,, that result may be wrong because of my wrong method... 
could you let me know the best compression rate of SPEEX and parameter setting of  good quality , good compression rate ?
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