Buzz Audio tonic 3 band equaliser - Manual (Page 4)

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Controls and Indicators continued…
[8] BYP – EQ IN
This switch will bypass all the Tonic
equalizer sections when in the BYP position with the
audio input connected directly to the audio output via
a relay. To engage the Tonic equalizers, the switch
should be in the EQ IN position.
[9]
This switch selects the high pass filter (HPF) in
and out of the Tonic signal path. The HPF is bypassed
when the switch is in the up position. The turnover
frequency of the HPF can be selected via jumpers on
the Tonic circuit board. See section 4 of this manual.
[10] LOW
This centre detented pot controls the amount
of boost and cut of the low (bass) band. The 12 o’clock
“0” mark is flat response (no boost or cut applied). +/-
15db range is provided.
[11] 120Hz - 60Hz
This switch selects the centre
frequency of the low band filter section in bell mode, or
the frequency of maximum boost/cut in shelf mode.
[12]
This switch selects the operating mode of
the low band section to shelving mode or bell mode
respectively.
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4] High Pass Filter Frequency Adjustment
Facility is provided on the Tonic set the high pass filter
frequency to either 50Hz or 85Hz depending on your
preference.
Locate the little black HPF FREQ jumpers as shown in the
above picture on the Tonic upper circuit board. To
change frequency you need to move both jumpers to
the 50Hz of 85Hz positions.
The Tonic is supplied from the factory set to 50Hz. The
HPF will not operate correctly if the jumpers are not in
matching positions or are missing.