11
IN
3
HF/LF CUT ON
4
HF CUT
5
LF CUT
6
The QURE features an IN control that enables you to set the level
at which the Q
URE filters operate. The level can be changed
between -12dB and +18dB.
To run the unit hotter set the level between the 0dB-position
and the clockwise position (up to +18dB).This will result in a more
intensely processed sound. Conversely, in order to achieve milder
processing, set the level between the 0dB-position and the
counter clockwise position (up to -12dB).
The IN control is followed by high (HF) and a low frequency (LF)
cut filters with individual frequency controls.The HF/LF CUT ON is
the hard-bypass switch for both filters. If the cut filters are not
needed the HF/LF CUT ON switch routes the audio around this
section to provide maximum audio quality when in bypass (LED is
not illuminated).
The HF CUT and LF CUT are usually used as a pair to provide
control over the extremes of the audio spectrum.
The HF CUT filter is a 2nd order Butterworth filter defining the
upper roll-off frequency the audio is to have.
Fully counter clockwise the control is set to its starting position of
20kHz. Even if the HF/LF CUT filters are activated there is hardly
any audible frequency limitation to the spectrum. All frequencies
below 20kHz are passing through.Turning clockwise reduces the
upper roll-off frequency until fully clockwise the minimum roll-off
frequency of 2.5kHz is reached.
Diagram 3 illustrates the frequency response curves for the
highest roll-off (20kHz) and the lowest roll-off frequency (2.5kHz).
The LF CUT filter is also a 2nd order Butterworth filter defining the
lower roll-off frequency the audio is to have.
Fully counter clockwise the control is set to its starting position of
40Hz. All frequencies above 40Hz are passing through. Turning
clockwise increases the lower roll-off frequency until fully clock-
wise the maximum roll-off frequency of 200Hz is reached.
Diagram 3 (page 12) illustrates the frequency response curves
for the lowest roll-off (40Hz) and the highest roll-off frequency
(200Hz).
