SPHINX
Project Twelve
8
5. OPERATION
Connect the mains cable of the Project Twelve to a
mains outlet.
Once you have connected all other components,
you should check again whether the audio and
optical connections to the pre-amp (if any) are
properly made.
Then you may switch the Project Twelve on with the
POWER switch (5.) on the rear panel.
N.B.:
If there is no optical cable connected to the
CONTROL IN jack (3.), you should cover this input
with the supplied dummy connector. Or else strong
light (from sun or lamp) may prevent the Project
Twelve from switching-on.
From now on you should switch the power amp on
and off with the STANDBY button of another Sphinx
component connected to the optical CONTROL IN
jack (usually the pre-amp).
This way all circuits will remain at working
temperature and the audio quality will be 100%
within 30 minutes after activating. Additionally it
considerably increases the life span of the
component.
The Project Twelve is in stand-by mode and the
LED (1.) shows a red indication.
Power On
Switch the Project Twelve on with the STANDBY
button of the other Sphinx component: the red LED
slowly blinks and after a short period changes to
green.
If you activate the power amp for the first time or
after a long period of non-use with the power 'off',
the amp will be at maximum performance after one
hour. From stand-by mode it takes only around 30
minutes.
Power off
Switch the Project Twelve off (stand-by) with the
STANDBY button of the other Sphinx component.
The LED changes from green to red.
N.B.
: If you need to switch the system on again
immediately, you should wait for at least 60 sec
though.
Because switching on the amp within 30 sec will
activate the protection circuits: the red LED will blink
rapidly.
Only if you will not be using the amp for a long
period (e.g. during holidays) should you switch the
amp off with the POWER switch (5.).
In stand-by mode the Project Twelve's power
consumption is around the 5 W mark.
Warnings
1. Never place two amps on top of each other.
2. The component should not be subjected to
moisture or fluids.
3. Do not touch the component and the
loudspeaker outputs especially not with moist
hands: this powerful amp can output voltages
in excess of 36 volt.
4. Before removing the top panel, you should
disconnect the mains cable and wait at least 30
minutes (because the power supply remains at
the maximum voltage for a long time).
Removing the top panel will void your warranty:
the panel should therefore only be removed by
an official Sphinx service engineer!
5. Before disconnecting a loudspeaker or audio
cable, please switch of the component with the
POWER switch (5.)
6. An AC extension cord should never be used
wholly or partly coiled: this poses a severe fire
risk!
Encountering problems...
The Project Twelve has extensive protection
circuits. These will activate when:
•
the temperature exceeds the limit (>70 °C),
•
the output has an Offset voltage (>+/-350 mV),
•
the output is shorted (current limit) or
•
there is no power supply voltage.
If, after power on, the protection circuits detect
something wrong the Project Twelve will
immediately switch to stand-by: the red LED
indication will blink rapidly.
In almost all cases the problem will be with the
loudspeaker cables.
Check them all and solve the problem.
If you can't find the problem or the cause is
definitely not the cables, please contact your Sphinx
dealer.
