Operating Notes - Martin Audio DX1 User Manual

< >
CONTENTS PRINT GUIDES
APPLICATIONS GUIDE
22

OPERATING NOTES

What happens on switch on?
As mentioned previously the DX1 can be programmed to go through a
'Wake up' sequence which ramps up the output level over a set time
period. The default is a wake up time of 10 seconds. The DX1 remembers
exactly how it was set up before it was switched off. This includes which
preset or user memory was loaded and the associated gain, delay and
limiter levels etc. It also remembers the input settings and the status of the
MUTE buttons. All of the factory presets are programmed to unmute
themselves automatically but this is overridden if the user manually mutes
the outputs prior to switching the unit off. This is of particular note in fixed
installations where an operator may decide to mute the outputs at the end
of a performance and then turn the unit off. The next time the unit is
powered up the mutes will stay on after the wake up routine has finished.
Grounding
The Screen (shield) pins on all audio connectors are normally connected
directly to the ground pin of the IEC mains inlet. The chassis is also
directly connected to this pin. Never operate this unit without the mains
safety ground connected. Signal ground (0V) is in turn connected to the
chassis ground.
To avoid ground loops, cable shields should be connected to ground at one
end only. The normal convention is that the shield is only connected at the
output XLR. Provision is also made for separately isolating each input and
output shield pin permanently within the DX1 by breaking the appropriate
PCB track, where marked with a box and an arrow next to each XLR
connector using a small drill bit or cutter. See the following diagram for
details.
XLR pin 1 Isolation points and 10dB pads
23
Martin Audio – DX1 Speaker Management System