user manual manual de instrucciones notice d ... - ZAJ PRO-AUDIO

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3.5. Limiter circuitThis system is an always active protection inside the XPA series of amplifiers. The ANTICLIP circuitryconstantly analyses harmonic distortion caused by excessive signal excursion at the power amplifier's output andautomatically reduces the input level in order never to exceed 0,5% total harmonic distortion.The great convenience of such a circuit in any kind of installation has to be remarked: The clear advantageof a limiting system in front of conventional compressors is that the former does practically not alter the dynamicrange, acting only when the distortion threshold is reached.3.6. Output connectionsSee diagram 6.1 for output connection possibilitiesThe output section on the rear panel features both Speakon® connectors (13) and threaded connectionposts (14).If you need to operate the amplifier in BRIDGED mode, you should place the “MODE” (10) switch inBRIDGE position. Input signal should be fed into Channel 1 of the amplifier and the output appears at the 2+ and 2-pins of the Speakon® connector and/or at the red connection posts.ATTENTION: Terminals 1+ and 1- should only be used in case of “STEREO” or “PARALLEL” mode andterminals 2+ and 2- in “BRIDGED” mode. Any other combination may impair final audio qualityWhen operating in BRIDGED mode, always make sure that the resulting load impedance of the installationis never below 4Ω.The connection cable that joins the amplifiers outputs and the loudspeakers must be of good quality,sufficient section and as short as possible. This is most important when the distances to cover are long ones i.e. upto 10 meters it is recommended to use a section not inferior to 2.5mm 2 and for superior distances 4mm 2 .4. OPERATION AND USAGE4.1. Start upPushing the switch button (5) lights up the integrated pilot light and both red "PROT" (4) LEDs during theapproximately 10 seconds needed to stabilize all voltages. The "PROT" LEDs will then turn off meaning that theamplifier is now operative.In a complete audio installation, it is important to start up the equipment in the following sequence: soundsources, mixer, equalizers, active filters and finally power amplifiers. To turn them off the sequence should followan inverse pattern.4.2. Input attenuatorsThis consists of rotative potentiometers, situated on the front panel (1).These attenuators enable the connection of different types of mixing tables, independent regulation leveland loudspeaker connections that allow an inferior power level that the level already supplied by the poweramplifier at its maximum power, with no danger of damaging, by careless handling, the volume of the pre-amplifiedmixer.Inside the device's packaging you will find a little plastic bag containing 2 transparent caps which protectthe input attenuation settings from unwanted manipulation. These caps are transparent in order to let you visualizethe current settings.Once inserted, they cannot be removed with bare fingers, for this purpose, a small screwdriver is needed.6
4.3. IndicatorsXPA amplifiers include a simple yet effective indication system.PROT indicators (4) show the absence of loudspeaker output signal. These indicators may light up forfollowing reasons:1. During start-up, until the STANDBY time has passed. This time period is needed for the internaloperating voltages to settle.2. A short circuit is detected at the loudspeaker terminals.3. The amplifier is outputting direct current or very low frequency signals that could damage theloudspeaker.In any case, should these indicators light permanently, this is a sign of malfunction and the causes shouldbe investigated.The clip indicators (3) light up just before the actual clipping threshold at the loudspeaker output is reached.The clip detection circuit considers supply voltage oscillations, so that a dependable clip reading is achieved, evenwhen operating with unstable mains voltage. It is usual that the CLIP indicators shine following the bassfrequencies when the amplifier operates at high power levels, as these frequencies carry the main energy. Takecare that the CLIP indicators are not permanently lit.Signal presence indicators SP (2) show the presence of a signal at the amplifier inputs. They light up whenthe input level is greater than -40dB.5. CLEANINGThe front panel should not be cleaned with dissolvent or abrasive substances because silk-printing couldbe damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid soap; dry it with a clean cloth. Becareful that water never gets into the amplifier through the holes of the front panel.7
Page 1: USER MANUALMANUAL DE INSTRUCCIONESN
Page 4 and 5: 1. IMPORTANT NOTECongratulations! Y
Page 8 and 9: MANUAL DE INSTRUCCIONES1. NOTA IMPO
Page 10 and 11: 3. INSTALACIÓN3.1. Ubicación, mon
Page 12 and 13: 4.3. IndicadoresLos amplificadores
Page 14 and 15: 1. NOTE IMPORTANTEFélicitations !
Page 16 and 17: 3.5. Circuit limiteur.Il s’agit d
Page 18: BEDIENUNGSANLEITUNG1. WICHTIGE VORB
Page 21 and 22: 3.5. LimiterschaltungEs handelt sic
Page 23 and 24: 6. DIAGRAMS 6. DIAGRAMAS6. SCHÉMAS
Page 25 and 26: 6.3. Block diagram 6.3. Diagrama de
Page 27 and 28: 6.5. Function diagram 6.5. Diagrama

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