MOTM

I can't answer to the specifics of this particular design; I just jumped in
because it seemed that two or three folks were thinking that the HP & LP
filters were some kind of arcane feature, or something apart from the filter
bank.

In a fixed filter bank, you simply have a bunch of stacked bandpass filters.
But why make bandpass filters for the top and bottom band, since you want to
extend it to the limits of human hearing? Just "open up" those outer ends
with HP/LP filters. Then you control the level of that "band." 



-----Original Message-----
Just trying to clear a little confusion on my part.... The HP and LP are 
shelving type of filters, correct?. Is their cutoff freq. below and above 
band 1 and 8? Or are they centered more towards a middle/center frequency?