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Traditional professional mixing consoles are all based on the same input structure. The signal from the microphone
goes through a phase reversal switch and then to a pad to attenuate the signal before going to the first
amplification stage. Some mixers even introduce a transformer before the first stage to simplify the circuits.
Reducing the signal level before amplifying it increases any noise. It also limits the range of input signal that can
be accommodated before overload distortion. This type of circuit has been OK for analog recording.
The new SONOSAX SX-S input stages do not reduce the microphone level before amplification. Instead we
control the amount of amplification. No new noise is introduced by this method.
By careful design of the input amplifier stages, it is now possible to handle a significant increase in the input level
before overload. Conventional input stages require the operator to do a delicate balancing act between the input
gain control and the channel fader to prevent unexpected input overload or so much gain that the noise comes up.
Thus, heretofore unattainable low noise input figures and high input headroom figures are a reality.
The new SONOSAX SX-S input modules have a new profile. The "Limiter Threshold", "AUX Level" and "PAN"
controls have been recessed. This removes any obstacles beside the P&G faders. Functionally the input modules
are the same as they have been for over a decade. The electronic components and the circuitry are modern. The
functionality was perfected many years ago. The SONOSAX SX-S still has the best limiter in the industry and
equalization control equaled by none.
The new SONOSAX SX-S input module has mini-switches on the back to change several parameters of its
operation. The "High Pass" filter can be switched in or out of the signal path with the "Equalization" or it can be in
the circuit all the time. The ON/OFF switch can actually turn the power to the channel OFF to preserve the
batteries, or it can be a "Mute" switch which can activate the channel without a pop in the signal. The switch to
select "Phantom 12V" or "T12V " power is of course still there.
The new modules are prefitted with connectors for VCA operation and the installation of the four Channel Matrix
Module and the AUX Module.
3.1 SONOSAX SX-S Input Module Specifications:
Equivalent input Noise Ohm Source
Bus Noise
GAIN
85 dB
Fader at +10 dB
60 dB
Fader at 0 dB
40 dB
Fader at 0 dB
20 dB
Fader at 0 dB
0 dB
Fader at -4 dB
Nom. input level 87 uV 1.55 mV 15.5 mV 155 mV 1.55 V
Max. Input level 2.57 mV 12 mV 120 mV 1.2 V 7.0 V
THD & N% 0.028 0.016 0.01 0.007 0.007
CMRR at 1kHz -103 dB -103 dB -104 dB -95 dB -78 dB
CMRR 20 Hz to
20
-85 dB -85 dB -85 dB -80 dB -60 dB
GAIN
85 dB
Fader at +10 dB
60 dB
Fader at 0 dB
40 dB
Fader at 0 dB
20 dB
Fader a t0 dB
0 dB
Fader at -4 dB
Noise linear -129.3 dB -128.4 dB -125.6 dB -110.5 dB -91.4 dB
Noise ASA A
-131.6 dB
-130.6 dB
-127.4 dB
-111.9 dB
-92.5 dB
6 Channels assigned @ Gain Fader at -4 dB -86 dBu
1 Channels assigned @ Gain Fader at -4 dB
-91.4 dBu
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