Reference Manual
Page 6 Reference Manual Page 7
12. 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 any sensitivity/gain.Note that every increase of the
gain will decreasethe S/N ratio.
13. Mode operationswitches
Setup these switchesfor the desiredoperation mode. Forreference see
14. Speakon outputconnectors
The unit hasfour Speakon connectorsas outputs: CH 1 and CH 2. Every onepermit the con-
nection of both channels for stereo operation or parallel mode. For bridge operation the
CH1 connector shouldbe used. Forreference see
15. A.C.Power cable
The unit have one A.C. power cable. Before connection, 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.
16. S.N. label
Every unit hasa label indicating:the model, andthe bar codeserial number.
Figure 1.
Figure 1.
Operation
Grounding
There is noground lift switchor terminal onthis amplifier. The signal groundis always
floating via aresistor to chassis,and the groundingsystem is automatic. If a potential above
0.6V is presentsin between signalground and chassisground, a short circuit is introduced
between the two,thereby enabling electricalprotection. If aunit in the system is faulty, its
mains fuse willblow due tothis automatic groundsystem. If however you wish to tie the sig-
nal ground tochassis, connect theXLR-connector`s shell lugto pin 1. In the interest of
safety never disconnectthe earth pinon theAC power cord.
For all unitsthat are FCCapproved (radio interference),there is an AC mains filter. Thisfil-
ter needs thechassis ground forreference, otherwise acurrent loop is formed via the signal
ground. Use thebalanced input toavoid hum andinterference.
Connecting Power andCircuit size requirements
Amplifier's power requirementare rated atidle, at 1/8and 1/3 power ("severe" music condi-
tion).The maximum powercurrent draw ratingis limited onlyby the internal fuses. Consult
the specification atthe end ofthis manual forthe power each amplifier will demand. Mains
voltage must alsobe correct andthe same asthat printed on the rear of the amplifier.
Damage caused byconnecting the amplifierto improperAC voltage is not covered by any
warranty.
Note: always switchoff and disconnectthe amplifier frommains voltage beforemaking
audio connections, andas an extraprecaution, have theattenuators turned downduring
power-up.
Cooling Requirements
Amplifier use aforced air coolingsystem to maintaina low, even operating temperature.
Drawn by ainfinitely variable speedfans mounted insidethe unit, air enters through the
front
grills with dustfilter, andcourses through thecooling fins of the heatsinks, which dissipates
power transistor heat,before exiting throughthe rear panelports. Make surethat there is
enough space aroundthe front ofthe amplifier toallow air toenter, and around the unitsto
allow the heatedair to exit.If the ampis rack-mounted, donot use doors or covers onthe
front and rearof the rack;the air mustflow through theamplifier without resistance.
Note: whatever typeof rack youare using, makesure that theheated air can escape freely,
and that thereis not resistanceto the intakeof cool airthrough the front grill.
Configuration
Use the configurationswitch configurate theamplifier to meetyour requirements. Thesetup
must be donewith the unitswitched off. Withthe switches andjumpers is possibleto
configurate the amplifierfor the followingfunctions:
Series Series
