1
3
3
4
4
7
7
6
6
5
5
1
2
2
D-10
D-20
7
FRONT PANEL
3
4
5
7
6
8
9
2
1
D-100
1: Power Switch: This single pole switch turns the amplifier fully off (but does NOT isolate it from the mains
supply).
2: Power LED: This indicates when the amplifier is active. This does NOT indicate the presence of a mains
supply when the power switch is OFF.
3: Attenuation Controls: These are analogue controls allowing precise level settings. Note that in bridged
(mono) mode some controls may be inactive.
4: A/P (Auto Protect) LED: If a condition exists, either internally or externally, that could cause damage to either
the amplifier or the speakers, the protection circuit will disengage the outputs and the A/P LED will illuminate.
The amplifier will continue to be monitored and depending on the type of fault, will either reset after the fault
has cleared or require manual resetting by switching off at the mains switch and then on again after a few
seconds. If the outputs are shorted or if DC is present, the protection circuit will disengage the outputs and the
A/P LED will illuminate. Temperature related faults will reset if the unit has cooled sufficiently. Output short
circuits will require manual reset after clearing the fault.
5: Bridge LED: This illuminates when a channel pair have been switched into bridged (mono) mode (channel A
+B or C+D). Note that the partner channel’s LEDs and controls are disabled when a pair of channels are
bridged. Bridge switches are on the rear panel.
6: The D-10 and D-20 have Signal LEDs that are active from a minimum output level of approximately 10 Watts
and are an indication only of signal presence. The D-100 has Signal Meter and OCM indicators: LED bar graphs
show instantaneous level on each channel to indicate proximity to the limiter threshold. Note that if the PRC
system is in operation on any channel, this will affect the readout shown on the respective meter. The red LED
in the meter will illuminate when the limiter threshold has been reached and limiting is occurring. The output
current monitor (OCM) may activate to limit the output current of the amplifier channel - this can occur even if
the amplifier has not reached clipping point. The OCM indicator can operate independently of the bar graph
meter. Typical conditions that may trigger the OCM circuitry would be very low load impedance, or high
subsonic or VHF levels.
7: Limit LEDs: The amplifiers incorporate signal limiters, which are preset to prevent clipping with high levels of
drive. The amber LEDs on the front panel illuminate to indicate operation of the limiters.
8: Link LED: This indicates if the channel is linked to its immediate neighbour. If this is illuminated, the
attenuation control of the channel to the immediate right will not function as both channels are being fed
from the left hand channel. The link switches are on the rear panel.
9: PRC LED: This illuminates if the Power Reduction Control has been enabled on the respective channel. PRC
switches are on the rear panel.
E11EVEN SOUND \
D series amplifiers
\
User’s Manual
