longer at maximum excursion than the bar-graph, facilitating the readout of peak
levels. The
VU selector
(
9
) on the rear panel of the
Monolog
amplifier toggles
between display modes. When the
LED VU Meter
is disabled, both
VU Mode
Indicators
(
9
) will be dimmed.
[ 5 ]
LED display TEMP and OFFSET
Should the operating temperature of the unit reach its maximum permissible value
the output relays will be automatically de-activated (no sound) and the
TEMP LED
(
5
) will be brightly lit. Once the temperature returns to normal design parameters, the
output relays will reactivate and the
TEMP LED
(
5
)
will
dim.
The
OFFSET LED
(
5
)
brightens and the output relays will be deactivated to protect
the loudspeakers
when the DC
-
protection circuit detects DC present at the output
terminals.
In this case the amplifier must be switched off to reset the protection
circuit. The
Monolog
amplifier can be powered up again after approx. 10
seconds.
If the
OFFSET LED
(
5
) is still brightly lit after the reset, there may be a defect in the
output stage and the unit must be sent in for service. Please contact your authorized
dealer, distributor or
Trigon Elektronik GmbH
directly. Since there may be a more
serious problem, at hand, the unit must be verified by a qualified service technician.
[ 6 ]
Gain LED 20dB, 26dB and 32dB
:
The push button labelled
GAIN
(
11
) located at the rear of the amplifier allows to set
the appropriate gain for your system. Three levels of gain are available.
The
20dB
setting should be tried first. This amount of gain (amplification factor) is the
lowest and usually offers the best noise figures. Since most current preamplifiers
output levels are high enough to be compatible with this setting, it is not necessary
to run the amplifier with increased gain, since higher voltage gain will not only
increase output levels, but can also lead to increased background noise.
We recommends to always starting with his lowest gain setting (
20dB
). The amplifier
gain should only be increased if it is not possible to drive the amplifier to maximum
output with the preamplifier. This can be easily verified with the
LED VU Meter
(
2
).
The selected gain setting is shown by the
Gain LED
(
6
)
[ 7 ]
LED Display BAL and UNBAL
This display shows the input selected with the
BAL/UNBAL Selector
(
12
).
To prevent switching noise in the loudspeakers, the output relays will be temporarily
disabled while inputs are being switched.
