Input Stage - SoundCraft MH3 User Manual

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MH3 User Guide
Ster Stereo Input Module Ster eo Input Module eo Input Module eo Input Module
Ster Ster eo Input Module

Input stage

A stereo version of the Mono input's high performance pre-amp offers the same gain range of
+15dBu to +60dBu (1) and a 20dB gain change switch (2). It also has Phantom Power switching
(3), and polarity reverse on the left channel (4). The peak LED (5) indicates signals in excess of
+18dBu on either left or right channels, while two MONO switches (6) cut either Left or Right
channel, feeding the alternate channel to both module paths, or if both are pressed, a mono
sum of L and R to the module paths.
Balanced Insert Points with INS switch
Separate jacks provide a pre-EQ balanced send and return, for Left and Right channels, at a
nominal level of 0dBu. See the rear connector panel.
EQ and HI-PASS Filter
The EQ section is stereo four band, with sweepable frequencies on all bands and is enabled by
pressing the EQ switch (7).
The frequency ranges are 35Hz-400Hz (LF)(8), 250Hz-2.5kHz (Low Mid)(9), 500Hz-5kHz (High
Mid)(10), and 1.8kHz-16kHz (HF)(11), with ±15dB of cut or boost available at any frequency.
The Q is fixed on all bands at 1.1.
The stereo High-pass filter is fixed at 80Hz, and is switched in with the High-pass switch (12).
Aux Sends
As on the mono input there are 12 sends (13), for FX or Monitor use.
Aux 1& 2 and 3&4 can be switched to stereo pairs for in-ear sends, using the adjacent STE
switches (14), colour-coded to match the relevant send knob. In this case, the A1 knob becomes
a stereo Level control, and the A2 knob becomes the PAN between Aux 1 and Aux 2. Similarly
for Aux 3 & 4.
Each send has 5dB of gain at maximum, and is always fed from a mono sum of the left and
right signals. ( If Aux 1 & 2 or Aux 3 & 4 are switched to stereo, these sends are fed with a
stereo signal, left to Aux 1/3 and right to Aux 2/4.)
The Auxes can be switched Pre- or Post-fader by the adjacent PRE switches (15), which are in
pairs for the first 8 sends, and as one group for Aux 9-12. The default Pre-fade signal for all
Auxes is pre-EQ but can be changed to post-EQ via internal links (both feeds follow the channel
mute).
Subgroup Routing
In addition to the 12 Aux sends, 8 busses are provided for conventional subgrouping.
Routing to these is via 8 individual routing switches (16). Normally the Group switches are fed
by a mono sum of left and right signals, but the STE switch (17) allows any odd/even pair of
group busses to be used as a stereo pair, following the channel's Balance control.
Mix Bus Routing and Balance controls
The signal is sent to the stereo mix bus and the mono bus using the MIX (18) and C (19)
switches.
The BAL (20) control allows the left signal to be faded down to zero level when turned fully
clockwise, and vice-versa for the right signal. In the centre position, both channels are fed at
unity gain to the Mix bus. The balance control also affects the L-R balance within the mono sum
Preliminary Issue
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