SONOSAX SX-ES64 - Manual (Page 9)

User manual SONOSAX SX-ES64 Page 9 of 27
4.1.5 Input GAIN setting [ MID – LO - HI ]
The primary input stage allows a wide range of input gain adjustment, ranging from-6dB to +80 dB
The maximum allowable input level is +21dBu
The input gain control is done in two stages using the primary gain switch [MID - OL - HI] and the [GAIN]
potentiometer located just above the switch ( also called TRIM ) for a progressive and fine adjustment of the
input gain. The potentiometer [GAIN] offers an adjustment range of +/- 20dB, ( 40dB in total ).
According to the position of the switch, the overall gain of the input ranges as follows
MID: the primary gain is 40dB, the overall gain ranges from 20dB to 60dB
LO : the primary gain is 12dB, the overall gain ranges from -6dB to 30dB
HI: the primary gain is 60dB, the overall gain ranges from 40dB to 80dB
NOTE: the overall gain range is quite wide and therefore the gain must be adjusted with cautions. An
excessive gain will leave little with headroom and can lead to clipping. On the opposite, a level
set too low will lead to a poor signal to noise ratio.
Check the input level using the 3 leds peak-meter of the channel and / or activate the PFL
mode to control your input gain.
4.1.6 Input Limiters
Each of the 6 input channels has its own independent Limiter which is part of the microphone pre-amplifier
circuitries. The retractable potentiometer [THRES] sets the threshold level above which the limiter becomes
active. The threshold can be adjusted between infinite and - 10dB below the nominal level.
Once the threshold level is reached, the activity of the limiter is indicated by the Green and Red Leds that light
up simultaneously on the small modulometre.
The attack time is very fast ( half sine wave only ) and the release time depends of the modulation.
NOTE:
The limiter will be automatically activated 2dB below the clipping level ( at +19dBu ) even if the
Threshold is set to minimum. This will protect the input stage and avoid clipping the input stage.
This offers an additional margin of 6 dB at the input.
4.1.7 Sweep LF-Cut [LF CUT]
This retractable potentiometer progressively adjusts the cut-off frequency of the LF-Cut filter. Also called High
Pass Filter, this sweep LF-Cut is commonly used to remove unwanted low frequency noises such as room
rumble, electrical hum, wind noise, popping, etc
The LF-Cut is adjustable from 25Hz to 350Hz with a fixed slope of 12dB per octave
NOTE: The LF-Cut circuitry is located just after the microphone preamplifier and is independent from
the "Pre LF-Cut" which is located before the microphone preamplifier.