Source Audio ZIO User Manual page 11

Analog bass preamp + di

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FOCUS Knob

The FOCUS knob can be used in conjunction with the BASS knob for more detailed low-end

contouring. The FOCUS knob is a high-pass filter control, which moves this bass-cutting filter to the

right into higher frequencies on the frequency spectrum, so as you rotate it clockwise, more low-end

will be cut. When the BASS control is active, using the FOCUS knob will peak the bass response, since

we are pitting a movable HPF against a bass-boosting shelving filter fixed at 100Hz.

Here are spectrum analysis figures for the FOCUS knob function, starting with all controls flat,

followed by the FOCUS at Noon (subtle high-pass filtering), followed by the FOCUS at maximum

(pronounced high-pass filtering).

Flat:

FOCUS at Noon (moderate HPF):

FOCUS at maximum (significant HPF):

SA272

ZIO Analog Bass Preamp + D.I. User Guide

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