Reference Manual
Page 6 Reference Manual Page 7
DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
13. Input Sensitivity/Gain
The standard settings are:1.4V,32dB,26dB,selection is independent for each channel. Use
this function to match the amplifier's sensitivity/gain with the other connected equipment.
As option, is possible adjust the unit for anysensitivity/gain.Note that every increase of the
gain will decreasethe S/N ratio.
14. Mode operationswitches
Setup these switchesfor the desired operation mode. For reference see
15. Speakon outputconnectors
The unit hasfour Speakon connectorsas outputs: CH 1 and CH 2. Every one permit the con-
nection of both channels for stereo operation or parallel mode. For bridge operation the
CH1 connector shouldbe used. For reference see
16. A.C.Power cable
The unit have one A.C. power cable. Beforeconnection, be sure that the cable is not frayed
or broken. The connection must be made only in a plug with the electrical ground wire sys-
tem.
17. S.N. label
Every unit hasa label indicating: the model, and the barcode serialnumber.
Figure 1.
Figure 1.
Operation
Grounding
There is noground lift switch or terminal on this amplifier.The signal groundis always
floating via aresistor to chassis, and the grounding system is automatic.If a potentialabove
0.6V is presentsin between signal ground and chassis ground, a shortcircuit is introduced
between the two,thereby enabling electrical protection. If a unit in thesystem is faulty, its
mains fuse willblow due to this automatic ground system. If howeveryou wish totie the sig-
nal ground tochassis, connect the XLR-connector`s shell lug to pin 1.In the interestof
safety never disconnectthe earth pin on the AC power cord.
For all unitsthat are FCC approved (radio interference), there is anAC mainsfilter. Thisfil-
ter needs thechassis ground for reference, otherwise a current loop isformed via thesignal
ground. Use thebalanced input to avoid hum and interference.
Connecting Power andCircuit size requirements
Amplifier's power requirementare rated at idle, at 1/8 and 1/3 power("severe" music condi-
tion).The maximum powercurrent draw rating is limited only by the internalfuses. Consult
the specification atthe end of this manual for the power eachamplifier will demand.Mains
voltage must alsobe correct and the same as that printed onthe rear ofthe amplifier.
Damage caused byconnecting the amplifier to improper AC voltage isnot covered byany
warranty.
Note: always switchoff and disconnectthe amplifier frommains voltage beforemaking
audio connections, andas an extra precaution, have the attenuators turned downduring
power-up.
Operating voltage
WARNING!
A labeljust below the mains cable onthe rear ofthe amplifier indicatesthe ACmains volt-
age for whichthe amplifier is wired. Connect the power cable only to theAC source referred
to on thelabel. The warrantywill not coverdamage caused byconnecting to thewrong type
of AC mains.
DP5.0 switch modeamplifiers use primary switching. The mainspower is beingrectified
directly in frontof the transformer, meaning thatthe power supplyis insensitive tothe mains
frequency .
If the powerplug is not appropriate for your country, itcan be cutoff and wiredto a suitable
connector in thefollowing way:
BLACK or BROWN LIVE
WHITE or BLUE NEUTRAL
GREEN or GREEN/ YELLOW EARTH
Once the AC connector is connected to a suitable AC supply, the amplifier can be started
with the power switch. When you power up the amplifier it takes a couple of seconds to
check its circuits(thisis known asthe soft start or slow start sequence), the fansthen blow
at high speed before going into idle, and the two bottom green LEDs come on to show the
output circuits arereceiving the correct rail voltage.
