Specifications

9
D. LOW CUT FILTERS
Low cut filtering is important in location recording where wind noise can cause
pre-amplifier overload. This effect can be minimized by switching the low cut
filter setting to either 80Hz or 150Hz. Each input channel of the DV Promix 3
Mixer is equipped with a low cut filter. These filters are activated via the three
way switches located to the left of the adjacent channel fader knobs. These
filters will attenuate all frequencies below a preset frequency at a rate of 6dB per
octave. When set at “20Hz”, frequencies below 20 Hz are effectively rolled off
with the mixer operating at full frequency response. Optional low cut filter
settings of 80Hz and 150Hz will roll off the frequencies below these figures at a
rate of 6dB per octave (-3dB level at 80Hz and 150Hz respectively). Always use
the minimum filter setting required for the job. For example, if you are indoors or
outdoors on a windless day, use the 20Hz setting. For outdoor use with low wind
conditions, use the 80Hz setting. For recording in high winds, use the 150Hz
setting.
E. CHANNEL GAIN
In order to limit noise and increase headroom, the channel fader controls are
located in the feedback path of the pre-amplifiers. This provides continuously
variable gain rather than just a decrease in channel output level when an
overload situation occurs. This results in increased headroom and lower chance
of signal clipping (severe distortion).