Quick Start Guide

8. Cooling and fan operation
10. Grounding
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D SERIES Lake Quick Start Guide rev 3.0.3
D SERIES Lake Quick Start Guide rev 3.0.3
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8. Cooling and fan operation
D Series devices use a forced-air cooling system with airfl ow from front to rear, allowing high continuous power
levels without thermal problems. To facilitate maximum air fl ow, ensure that no objects such as rack doors or
lids are placed at the front or rear of the rack. Never attempt to reverse the airfl ow. Make sure an adequate air
supply is provided in front of the D Series device, and that the rear of the device has suffi cient space to allow
air to escape. It is recommended to keep the ambient temperature around the device as cool as possible. An
increased temperature can have a signifi cant negative impact on the expected lifetime on the components
inside the D Series device.
NOTE: Fit solid blanks (not ventilation blanks) to unused rack spaces to ensure effective air circulation.
Leaving gaps in between items of equipment degrades the effectiveness of forced-air cooling.
If installing one or more D Series devices in a rack with other fan-cooled equipment, confi rm that all other
equipment also uses front-to-rear airfl ow for cooling. If this precaution is not observed, there is a risk of
overheating, as units with the reverse airfl ow will be drawing in air which has already been heated by the
D Series devices.
The D Series device is equipped with a sophisticated temperature sensing system which protects it from any
overheating which may occur as a result of inadequate ventilation.
9. Operating voltage
D Series has a universal power supply and its mains nominal and operating voltages are specifi ed in the Technical
Specifi cations (Section 15). D Series can be ordered with a variety of mains plugs. If the mains plug (AC plug) fi tted
to the mains cable (AC cord) is not appropriate for your country it can be removed and a locally-sourced one fi tted
instead. If you are not 100% confi dent of your competence to replace the mains plug (AC plug), the task should be
carried out by qualifi ed personnel.
NOTE: In-rush current is controlled and limited during the soft-start sequence. This enables multiple
D Series Devices on the same AC mains circuit to be turned on simultaneously.
9.1. Low voltage country considerations
Although the D Series has a wide range of operating mains voltage, some considerations can be applicable for
low voltage regions. D Series performs well throughout the specifi ed nominal voltage range but has slightly better
effi ciency at higher voltages. For regions with nominal voltage below 140 V, one could consider connecting the
amplifi er in a three phase delta or two phase split-phase confi guration, especially applicable for the bigger models,
(D 200, D 120 and D 80).
NOTE: Following connections applicable only for resulting voltage inside the amplifi ers nominal voltage
range.
Connecting the amplifi er in three phase delta confi guration
In three-phase confi guration where the phases are 120 degrees apart, one can connect three balanced loads in a
delta confi guration. The connection is made between the phases instead of between the neutral and a phase.
Amp
120V
120V
120V
L1
Amp
L2
L3
Amp
N N
Amp
Amp
Amp
3 phase Y 120V
3 phase delta 208V
208V
208V
208V
L1 L2
L3
Three phase delta confi guration
Connecting the amplifi er in a split phase confi guration
In two phase split-phase confi guration there are two phases separated by 180 degrees. Connecting between the
phases gives double the line voltage.
Two phase split-phase confi guration
10. Grounding
D Series must be grounded (earthed) with the safety ground pin to the mains distribution system.
NEVER disconnect the earth (ground) pin on the mains cable (AC power cord).
Use correctly-shielded balanced audio input connections to minimize hum and interference.
Split phase 100V
100V 100V 200V
L1
Amp
L2N
Amp
Split phase 200V
L1 L2
N
Amp