Australian Monitor SY800 - Manual (Page 7)

Australian Monitor
Front Panel
The Synergy Series differ only slightly across all
models and all share the same features on their front
panels.
shows the panel layout of three Synergy
amplifiers, SY4200, SY1200 & SY6125. The
SY1200 looks the same as the SY400, SY800,
SY1600, SY400V & SY800V. The functions of the
controls and indicators are as follows:
Level control for your amplifier is provided by a
potentiometer on the front panel and indicates
gain. There are 2 controls on all
models
except the SY4200 which has 4 controls and the
SY6125 which has 6 controls. Each control is
labelled for the channel which it controls.
This is a dual colour LED which displays the
status of the output stage and displays three
levels of operation.
These levels are:
Below 1 watt
(unlit)
1 watt and above ( )
1dB below actual clipping ( )
The LED will turn green once the output voltage
exceeds 2.828 volts (1 watt re 8 ohms or 2 watts
re 4 ohms). For the SY400V & SY800V the output
voltage is 10 volts & 7.070 volts (2 watts re 50ohm
& 25ohm) respectively
The LED will change to red once the output
exceeds the -1dB point before actual clipping of
the amplifier’s output stage. The threshold of the -
1dB point is referred to the amplifier supply rails
and alters with changes in the mains supply,
changes in the load and duty cycle fluctuations.
The attack and decay time (ballistics), of the
status circuit are those of a Peak Programme
Metre (P.P.M.)
If using this indicator to line up sensitivities, apply
a steady state tone (e.g. slate on a mixing
console). The 1 watt level is the mid-point
between the indicator illuminating and
extinguishing green.
Figure 1
1 Attenuator
2 Status Indicator
Synergy
green
red
NOTE: The amplifier is not damaged by running
into clipping,
. To maximise
the life of your speakers, try to keep clipping
infrequent. Clipping on the SY400V & SY800V
may cause speaker transformers to saturate
causing the amplifier to shut down. For this
reason the voltage limiters should always be
engaged on the SY400V & SY800V (see Rear
Panel-Limiter Switch on page 11).
This LED will illuminate when an overload
condition exists.
Overload conditions can occur under extreme
operating conditions such as:
- complex or very low loads
- over driving the amplifier
- speaker transformer saturation
It should be noted that the minimum load for the
amplifier is 4 ohms per channel (8 ohm bridged)
except the SY400V which has a minimum load of
50 ohms per channel and the SY800V which has
a minimum load of 25 ohms per channel. (The
SY400V & SY800V cannot be bridged).
If an overload occurs, the amplifier will shut down
and mute all outputs except the SY6125 &
SY4200 which will only mute the channel with the
overload. If the overload is only transitory, then
the amplifier will resume normal operation after
approximately 7 secs. If the fault is continuous,
then the amplifier will remain muted.
Press the switch to for power ( )and
for power ( ). At start-up (turn-on), the input
to the amplifier is muted for approximately two
seconds.
but speakers may be
3 Overload Indicator
4 Power Switch
amber
up on I down
off 0
5 Thermal Indicator
In the advent of a thermal overload, this LED will
turn
indicating that the internal operating
temperature of one or both amplifier channels
has exceeded a safe level of operation and the
channels will be automatically muted. The fans
will continue to run and once the effected
channel/s have had a cool-down period, they will
un-mute and return to normal operation.
red,
Controls & Connectors 7