Peavey ICS 4200 user manual Bridged Mode

Bridged Mode

A pair of amplifiers may be bridged together to make a single output with a power rating equal to the sum of both channel power ratings at twice the load rating of a single channel. In other words‚ bridging two amplifiers rated for 200 Watts into 4 Ohms will produce 400 Watts into 8 Ohms. In Bridged Mode‚ the channels operate at opposite polarity from each other so that one channel pushes and the other pulls equally. This mode sends the input signal to one channel and the same signal with its polarity reversed to the other channel in the pair (A/B or C/D). For example‚ connect the input signal to Channel A input connector. Then‚ connect a jumper wire from the positive (+) terminal of the Channel A input connector to the negative (-) terminal of the Channel B input connector. Likewise‚ connect a jumper wire from the negative (-) terminal of the Channel A input connector to the positive (+) terminal of the Channel B input connector. (See below.) Both channel level controls (in this example‚ A & B) MUST be used to control the signal level and both MUST be set at the same position. The input level controls are detented to match these settings precisely.

Note: Due to the unique input topology‚ the module ports CAN NOT be set up to drive the amplifier in Bridged Mode.

The loudspeaker load is connected only to the designated positive (+) output terminals of the bridged channels. NEVER ground either side of the loudspeaker load cable when the amplifier is in Bridged Mode as both sides are “hot.” If an output patch panel is used‚ all connections must be isolated from each other and from the panel. In the Low Z output mode‚ the minimum nominal load impedance in Bridged Mode is 8 Ohms; this is equivalent to driving both bridged channels at 4 Ohms. In the 70 V output mode‚ the bridged output is 140 V and the minimum load impedance in Bridged Mode is 50 Ohms. Driving loads of lesser impedance may activate the protective muting system. See OUTPUT MODES below.

Note: Regardless of operating modes‚ NEVER connect the amplifier outputs together.

Caution: Output voltages greater than 120 V RMS are available between the bridged terminals. CLASS 3 wiring must be used in accordance with national and local codes to connect the loudspeaker system.

Warning: The loudspeaker output connections of this amplifier are hazardous when live and present a shock hazard when they are energized. Take the following precautions:

1.Do not touch any bare wires that are connected to the loudspeaker output connectors.

2.Use insulated loudspeaker cables and touch-proof connectors on the loudspeakers.

3.Do not attempt to make connections to the output connectors or the loudspeaker connectors when the amplifier is turned on.

4.Double-check all connections and make sure there are no exposed wires or connectors before turning the amplifier on.

5.Make sure there are no frayed-cables or wires and that all connections are tight and secure every time before turning the amplifier on.

6.External wiring connected to these terminals requires installation by a trained person or the use of ready-made leads or cords.

11