Loudspeaker Mute
This switch mutes the monitor and alternate LS outputs. This is particularly useful
when using headphones, enabling the main monitors to be muted without needing to
turn off their amplifiers. It is also useful for temporarily muting the monitors without
needing to alter any fader levels, for instance during a telephone call.
It is good practice to mute the outputs when switching the MI on or off, to avoid any
loud "thumps" in the loudspeakers.
Metering
Two illuminated VU meters on the MI will normally monitor the main stereo output,
but automatically switch to monitor the PFL buss when any PFL switch is engaged.
Similarly, when a 2T return is selected as the monitor source the meters will
automatically switch to monitor that 2T return. The meters are calibrated to indicate
OVU when a signal level of +4dBu is generated at the main outputs. A pair of red
Peak LEDs operate on the stereo buss as a conventional warning that clipping is about
to occur. The LEDs illuminate at a threshold of +19dBu, when there is less than 7dB
of headroom remaining on the main outputs. Normal operation would be to set the
stereo buss fader levels so that occasional illumination of the Peak LEDs occurs on
loud transients.
Digital Output Option
The optional DO8 card can be fitted to the back of the M 1, providing 8 channels over
ADA T lightpipe. This professional protocol makes for easy connection when
conducting computer based recording, and makes the Ml the perfect front-end solution
for digital recording set ups.
There is also the optional DO2 card that fits into the back of the master section of the
M1 and provides stereo digital output in SPDIF format (RCA Phono connectors). The
DO2 has a fixed 24 bit word length, but the sample rate is switchable between 44.1,
48, 88.2 and 96 kHz. These are selectable from the back of the digital card.
Word clock Input
A rear panel input (on the back of the DO2 & DO8 card) is provided for connecting
the M 1 to an external master clock source. The wordclock input connector is a BNC-
type terminated in 75 ohms.
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