SONOSAX SX-R4 User Manual - Hardware Description - Manual (Page 8)

SONOSAX SX-R4 User manual / Hardware description Page 8 of 19
4.1.3 Pre-LF Cut Filter [ LF Cut ]
In lower position, this switch activates a passive low frequency cut circuitry (Pre LF-Cut). The Pre LF-Cut
filter circuitry is acting before the microphone pre-amplifier to attenuate the low frequencies of high level that
could affect the pre-amplifier and thus preventing an optimal setting of the input gain.
These low frequencies of high level can be generated, among other, by the microphone capsule especially
when recording outdoor in strong wind condition.
This Pre LF-Cut frequency is set at 135Hz and its slope is –6dB/octave.
4.1.4 Input Attenuator [ PAD ]
In lower position, this switch activates a 20dB Line attenuator [PAD] on the corresponding channel.
NOTE:
The [PAD] should only be used for high level signals such as Line level coming from an
external device. For an optimal signal to noise ratio it is recommended not to use the PAD.
4.1.5 Polarity reversal [ Ø ]
In lower position, this switch reverses the polarity of the input signal. It can be used to correct a cable wired
in reverse way or to address a phase problem due to microphone(s) placement.