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GTM Front Panel Layout
XLR Microphone input
This standard 3 pin XLR is the input of the
user’s
microphone. +48V phantom power
can be enabled or disabled for use with condenser microphones using rear panel
controls or via GlenController. A compressor is available which can be toggle on or off
in GlenController.
For use with different headsets, the GTM can be fitted at the factory with a female 5-pin
XLR, male 4-pin XLR or standard female 3-pin XLR. The GTM can also be wired with the
2.5V/5V DC bias routed to this connector for use with single ended electret microphone
headsets. See the end of the manual for wiring information.
Headphone output
The GTM headphone output can drive headphones with impedances between 16 and
1000 Ohms. It can accept mono jacks without causing and damage to the output
circuits. There is a
6.35mm (1/4”) stereo jack sock
et and 3.5mm stereo jack socket for
convenience meaning no adapter is necessary.
For these two connectors, only one set of headphones may be used at the same time,
therefore the 3.5mm output is disabled when headphones are connected to the
6.35mm output.
TRRS Headset
This 3.5mm 4-pole TRRS connector allows PC or Gaming headsets to be used with the
GTM.
This connector is fed from a second independent microphone preamplifier channel
and a second independent headphone output circuit.
A TRRS headset or just standard TRS headphones can be connected. This output can
drive headphones with impedances between 16 and 1000 Ohms.
This connector provides a configurable DC bias voltage to power the electret
microphones commonly found in PC and gaming headsets. The DC bias voltage can be
set to 2.5V or +5V using rear panel controls, or via GlenController. As standard
this connector is wired for the CTIA pinout, but OMTP may be available on request. See
the end of the manual for wiring information.
This connector can be used in conjunction with the other headphone output to drive
two sets of headphones at the same time. Refer to
XLR Microphone
input
Headphone output
TRRS Headset