[sdiy] Graphic EQs? (was Output circuit)

[Chromatest Pantsmaker]

Edu Silva wrote:

> Use an EQ to narrow the freq response from 40Hz to 15kHz.

I've seen several different graphic EQ's, but never really needed to
use one, so never really gave them much thought.

My one question at this point is as follows;  what happens to the
audio that is above and below the highest and lowest (respectively)
bands of the EQ?  Are the 'end-point' bands set to attenuate all
frequencies beyond them, or do the ultra, and sub sonic frequencies go
through untouched?

thanks all.

-ben