On Thu, May 27, 2010 at 12:15 PM, Andrew Faraday <jbturgid@hotmail.com> wrote:

Your hip~ at the end isn't needed if you've already got one at 50hz,
I'd be very cautious of trying to band pass just the fundamental tones of voice too, there's a lot of harmonics in the human voice, not to mention bits of 'noise' signal (like the 's' and 't' sounds) which need treble to be heard as language.

...given that, a band pass can still be useful, but the upper limit shall be set far above 255hz.
Actually, i think even the lower limit will be higher than 255hz, or around that.
My recommendation is to try a 300-3000hz band, and of course to listen and adjust accordingly.