LOW CUT FILTER
The Boulder 2008 Phono Preamplifier uses a 3 pole (18 dB/octave)
low cut filter which may be switched to one of 3 frequencies or com-
pletely out (off). The frequency response will be -3 dB at either 5, 10 or
20 Hz.
Because this filter is fairly steep, its effect is virtually negligible in
the audio band. It is recommended that it be kept turned on in order to
avoid excessive woofer travel caused by imperfect records.
Select a low cut frequency point by pressing one of the pushbuttons
labeled 5 HZ, 10 HZ, or 20 HZ. The chosen frequency indicator will be
amber.
To completely turn off the filter, press the pushbutton labeled OUT.
The OUT indicator will be amber and none of the frequencies’ indica-
tors will be illuminated.
WARNING: Due to some low frequency content of many record-
ings, care should be taken in regard to volume level when changing
low cut filter frequencies as there may be some audible transient (click).
This effect is normal.
OPERATION
3-4
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