Peavey CS 800x4 owner manual Protection Features

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Protection Features

The CS® 800x4 amplifier incorporates several circuits to protect both itself and loudspeakers under virtually any situation. Peavey has made this amplifier as foolproof as possible by making it immune to short and open circuits, mismatched loads, DC voltage and overheating. If a channel goes into the DDT™ gain reduction mode, the DDT LED illuminates. The speaker load remains connected, but clipping percentage or output power is instantly reduced. When a problem occurs that causes a channel to go into a protection mode, the PWR (Power) LED for that channel will turn off. DC voltage on the output, excessive subsonic frequencies, or thermal overload will cause the channel’s output relay to disconnect the speaker load until the problem is corrected or the amplifier cools down.

Distortion Detection Technique (DDT) Limiting

Any time a channel is driven into hard, continuous clipping, the DDT circuit will automatically reduce the channel gain to a level just slightly into clipping, guarding the speakers against the damaging, high-power, continuous square waves that may be produced. Situations that may activate the DDT circuit include uncontrolled feedback, oscillations, an improper equipment setting or malfunction upstream from the amplifier. Normal program transients will not trigger DDT; only steady, excessive clipping will cause the DDT LED to illuminate.

LFC Impedance Sensing

The CS 800x4 amplifier features innovative circuitry for safe operation into any load. When an amplifier senses a load that overstresses the output stage, the Load Fault Correction circuit adjusts the channel gain to a safe level. Extreme load fault under high power levels will cause the signal to be muted for the associated channel. This method of output stage protection is far more effective than the standard limiting found on conventional power amplifiers. The LFC circuit is sonically transparent in normal use and unobtrusive when activated.

Thermal Protection

The internal fan will keep the amplifier operating well within its intended temperature range under all normal conditions. If the heat sink temperature reaches 85°C, which may indicate an obstructed air supply, the channels will protect themselves by disconnecting their load and shutting down until the heat sink has cooled. During this time, the PWR LED will go out, the DDT LED will stay lit and the cooling fan will continue operating at high speed.

Short Circuit

If an output is shorted, the LFC and thermal circuits will automatically protect the amplifier. The LFC circuit senses the short circuit as an extremely stressful load condition and attenuates the signal, protecting the channel’s output transistors from over current stress. If the short circuit remains, the amplifier will eventually thermally protect itself by opening both channel speaker relays, disconnecting the loads until the heat sink cools down.

DC Voltage Protection

If an amplifier channel detects DC voltage or subsonic frequencies at its output terminals, its speaker relay opens and disconnects the load to prevent speaker damage.

Turn-On/Turn-Off Protection

Upon powering-up, the amplifier mutes the input signals and stays in Protect mode with the speaker connect relays open for approximately four seconds. This allows the internal power supplies to charge and the amplifier to stabilize. After the relays engage, the signals slowly increase the muted signals to their normal level. Also, when power is removed, the input signals are muted so that no thumps or pops are heard.

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Contents Page Page Important Safety Instructions Bewahren SIE Diese Sicherheitshinweise AUF Gardez CES Instructions Guarde Estas Instrucciones Unpacking Power AmplifierMounting Cooling RequirementsConnecting Inputs Operating PrecautionsConnecting Outputs Connecting PowerWire Gauge Charts Stereo Operation Operation ModesParallel Operation Bridged Mono OperationAC Power Circuit Breakers Front Panel Rear Panel Switches & ControlsMode Select Switch Input AttenuatorsPWR LED Front Panel IndicatorsProtection Features Speaker Protection RampUp Signal ControlService / Warranty Information Amplifier Maintenance and User ResponsiblityPower Amplifier Power Amplifier Auspacken EndstufeMontage KühlanforderungenSicherheitshinweise für den Betrieb EinleitungAnschluss der Eingänge Anschluss der AusgängeKabelstärkentabellen Stereobetrieb BetriebsmodiParallelbetrieb Bridged-Mono-BetriebWechselstrom-Netzschalter/Leistungsschalter Vorderseite Rückseite Schalter und ReglerEingangsdämpfer MODE-WahlschalterVorderseite Anzeigen Schutzfunktionen Lautsprecherschutz RampUp-SignalregelungEinschalt-/Ausschaltschutz Kundendienst Informationen zur Garantie Wartung Des Verstärkers Und Verantwortung Des NutzersEndstufe Specifications Amplificateurs de Puissance InstallationDéballage RefroidissementConnecter les entrées de votre unité Inputs Précautions d’UtilisationConnecter les entrées de votre unité Outputs Alimentation ElectriqueLa Charte De Dimensions Des Cables Stéréo Modes d’OpérationParallèle PontPanneau Avant Panneau Arrière Sélecteurs & Contrôles Panneau Avant Indicators Systèmes de Protection Système RampUp contrôle de montée en puissance Protection des Haut-ParleursRéparation/Informations de Garantie Maintenance et Responsabilité d’UtilisateurAmplificateur de Puissance Power Amplifier Desembalaje Etapa de PotenciaMontaje Requisitos de enfriamientoPrecauciones de Operación IntroducciónConectando Entradas Conectando SalidasTablas de Calibre del Cable Operación Estéreo Modos de OperaciónOperación en Paralelo Operación en Mono BridgedBreakers del circuito de alimentación AC Panel Frontal Panel Trasero Interruptores & ControlesAtenuadores de Entrada Interruptor de Selección de ModoLED PWR Panel Frontal IndicadoresCaracterísticas de Protección Control de Señal RampUp Protección de los altavocesInformación sobre servicio post-venta y garantía Mantenimiento del amplificador y responsabilidad del usuarioEtapa de Potencia Etapa de Potencia Peavey Electronics Corporation Limited Warranty 2005