User manual QSC AUDIO CX 4

[. . . ] CX Series USER MANUAL w w CX4 CX4T w CX6 w CX6T w CX12 Rev. B *TD-000057-00* w CX12T *TD-000057-00* 31 Table of Contents PART 1--CX SERIES USER MANUAL I. Warning Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Speaker Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] CX4T, CX6T ET CX12T (opération 140V et 200V)--On doit utiliser du câblage entièrement isolé de CLASSE 1 pour relier l'amplificateur aux haut-parleurs. VORSICHT BEI MONOBRÜCKENBETRIEB: ALLE TYPEN--Zwischen den Ausgangsklemmen der CX-Verstärker können Ausgangsspannungen bis 160 Volt RMS anliegen (200 Volt bei isolierten Ausgänge). 200VBetrieb)--Der Anschluß muß vom Verstärker bis zum Lautsprecher mit vollisoliertem Kabel erfolgen. PRECAUCIÓN PARA EL MODO MONO PUENTE TODO LOS MODELOS-- Voltajes de salida de hasta 160 VRMS existen entre los terminales de puente del amplificador CX (200 voltios a las salidas aisladas). CX4T, CX6T Y CX12T (operación 140V y 200V)--Utilice cableado de CLASE UNO totalmente aislado para conectar las altoparlantes. Instructions for bridged operation CX4 and CX4T 1. To engage the bridged mono mode, jumper the barrier strip inputs on the rear, in accordance with the diagram printed under the barrier strip inputs. Connect the amplifier input to channel 1 only, with the jumpers as shown to channel 2. Channel 1 and channel 2 gains must be matched. A 4, 8, or 16 ohm speaker load can be connected across the two red speaker terminals, using the red binding post of channel 1 for "+" or "hot. " CX6, CX6T, CX12 and CX12T 1. Set the switch to the "Bridge" position. Connect the signal to channel 1's input only. Do not connect an input signal to channel 2. However, as a convenience for routing the same signal to multiple amplifiers without using Y connectors, the mode switch connects the channel 1 and channel 2 inputs in parallel. Therefore, you can use channel 2's input terminals to pass the audio signal on to other amplifiers. Use only channel 1's gain control to set the level. Both channels' "SIGNAL" and "CLIP" indicators should flash identically when the amplifier is operating. Connect the single speaker load across the + amplifier outputs as shown in the Outputs chapter. The positive speaker wire goes to channel 1, and the negative to channel 2. 12 MAXIMUM LONG-TERM OUTPUT POWER In a properly designed sound system, you can obtain the desired sound level without using the full output power of the amplifier; if the "CLIP" indicators flash once in a while, that is perfectly normal. If the amplifier is operated at extremely high power levels, it may overheat or may even damage the speakers. The amount of stress on the amplifier depends largely on the load and how hard the amplifier drives it. In general, the lower the load impedance, the more stressful the load is. 8-Ohm Loads and Lightly Loaded 25V, 70V, or 100V Lines The amplifier can operate at practically any power level without risk of overheating. However, if it is pushed hard enough to continually light the "CLIP" indicator, the amplifier's average output power can reach 110 to 475 watts (depending on the model), which is more than many speakers can handle. 4-Ohm Loads and Heavily Loaded 25V, 70V, or 100V Lines If the "CLIP" indicator flashes occasionally, the amplifier is approaching its maximum long-term power capacity. If it is lit about half the time, the amplifier channel will probably go into thermal protection within a few minutes. 2-Ohm Loads Except for an occasional flash, keep the "CLIP" indicator dark to avoid overheating the amplifier channel. AC CURRENT CONSUMPTION A major objective in the design of the CX Series amplifiers-even the higher-powered models-is to permit their operation from readily available, standard AC power sources. "Normal conditions" in power amplifier rating means operating with a random program source (pink noise), using pink noise as a source, at an average power level equal to one-eighth of maximum power. [. . . ] If you adjust the amplifier gain controls to vary the sound level from the directly connected 26 speaker, it will affect the sound level from the distributed line's speakers also, possibly altering them from your intended levels. An alternate method is to attach an 8-ohm speaker across the 25-volt outputs. This provides up to approximately 80 watts to the speaker and makes more power available to the 70V or 100V connections: up to 75 watts for the CX4T, up to 150 watts for the CX6T; up to 400 watts for the CX12T. WIRE LOSS Even the highest-quality copper wire has a small amount of resistance to electrical current flow, and the wire's resistance is inversely proportional to the cross-sectional area of its conductor. Therefore, to minimize the power lost to speaker cable resistance, you should use the largest stranded (always stranded) copper wire that is practical for the job. [. . . ]