frequency seperator

you would need sussessive band-pass filters each one tuned to each of the freq you are after
 
You still aren't giving us any useful information, if you give explicit information we can try and give explicit answers, vague questions can only get vague answers.

What EXACTLY are you trying to do?.
 
Sounds like he wants LP, BP and HP filters. It might be a speaker X-over he is after. (Only my guess)
 
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