SONOSAX SX-R4 (Firmware v3.1) - Manual (Page 9)

User manual SONOSAX SX-R4 Page 9 of 53
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 –6 dB/octave.
4.1.4 Input Attenuator [ PAD ]
In lower position, this switch activates a 20 dB 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 Phase reversal [ Ø ]
In lower position, this switch reverses the phase of the input signal. It can be used to correct a reversed cable
wiring or to address a phase problem between two microphones due to their placement.