Aurora Audio GTM822-2GN - Manual (Page 8)

6. Adding extra channels
Channels can be added, eight at a time, by connecting add-on units to the GTM
master unit. The add-on units are basically identical to the GTM master unit,
but there is no monitor/meter section or audio connections to the bus outputs.
The only control to the right of the channels is the “TRACK” button that
enables the input sources to be switched, globally, eight channels at a time.
The add-on units are connected together and to the master GTM via link cables
that connect to the polarized 9 pin “D” connectors on the rear panels. These
cables carry the bus combining signals and also the solo and mute data that will
ensure that the solo-in-place ripples through all the channels of the expanded
GTM set up.
The GTM master and add-on units all operate from a single linear power
supply rack with multiple dc outputs to power the GTM, the GTP8 mic pre
rack, and GT8x8 and GT8x2 bus expansion units.
7. Hints for obtaining the best performance from your GTM
The GTM has ventilation slots across the entire width of the top and bottom
panels at the rear of the unit. This is to provide a good cooling airflow to the
amplifiers, all of which are located at the rear of the unit… the front panel
circuit boards are passive. Please ensure an adequate airflow in this region by
not placing the GTM directly between two deep rack mounted devices that
might cover the slots. The GTM is over 15” (380mm) deep so most rack
equipment is shorter than this and will clear the slots. If this is not the case
please space the GTM apart from deep rack units by using narrow 19” rack
blank panels.
As with most professional audio equipment, the GTM must be grounded.
Please do NOT use any earth/ground lifting adapters on the GTM power cords.
Ideally a studio should have an independent technical earth, separate from the
grounding for other areas of the building (like kitchen and air-conditioning)
and all the studio equipment should be bonded to this clean technical earth.
This is easily achieved if the circuit breaker box feeding the studio has the
ground bar connected to the technical earth and all power outlets connected to
this ground point.
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