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SX-ST / SX-SV User Manual page 13
4.5 LF Cut and Equalizer
The SONOSAX SX-ST / SX-VT series input module is equipped with a powerful filtering and equalization section.
Its design is derived from our previous model SONOSAX SX-S on which the efficiency and sonic integrity have
been well proven in practice for decades.
The Equalizer IN or OUT switch activates or bypasses the filtering of 80 Hz, 8 kHz and MF tones. It is also used
for instant comparison of filtered and non-filtered audio.
NOTE: The EQ IN/OUT switch can be configured to include the LF Cut or not, depending on the position of
the jumper S-7 on the circuit board. By default, the LF Cut is not dependant of the EQ In/Out switch.
Following filters are available:
• LF CUT: also called High Pass Filter, this Low Frequencies filter has a fixed slope of 18 dB per octave.
The cut-off frequency is progressively adjustable from 15 Hz up to 400 Hz.
This filter is commonly used to remove unwanted low frequency noises such as room rumble, wind
noise, popping, etc. For quality reasons, the LF Cut is located after the pre-amp stage, however in
cases of extreme high wind noise or loud room rumble, it may becomes difficult to capture clear sound.
In such cases, we recommend to use an external LF Filter like e.g. the LC60 or LC120 made by
Shoeps.
• 80 Hz and 8 kHz: bass and treble adjustments are achieved using two ± 15 dB knobs.
• MF: is a semi-parametric (swappable) equalizer with a broad fixed bandwidth. ( Q Factor: xx )
Medium frequencies adjustment is achieved using one knob to progressively adjust the central frequency
from 200 Hz to 8 kHz, the other to adjust the amplitude within a range of ±15 dB.