CP400 & CP700 COMMERCIAL POWER AMPLIFIER
OWNER'S MANUAL
9.Stereo/Parallel/Bridge Switch
This 3 position switch changes the operating mode of the amplifier. DO NOT move this switch when the amplifier is powered up and connected to a load.
•Stereo - When the switch is set to this position, the amplifier operates as two independent amplifiers. Use this position for stereo program material or for two discreet paging/sound masking zones.
•Parallel - When the switch is set to this position a single mono input signal is to be used. Connect the input wiring to either channel 1 OR channel 2. The one input signal will drive both amp channels. Use this position when two speaker zones are being fed by a mono signal. (See note below)
•Bridge - When the switch is set to this position, connect the mono input signal to channel 1 ONLY. The speaker load is connected across the two positive terminals as shown in Figure 7 on page 10. The amplifier will deliver approximately twice the voltage across the load. Please observe the minimum load specification when operating in Bridge mode.
Note: A 6 dB loss of output power will occur when operating in parallel mode. To over come this loss, connect the positive terminal on input 1 to the positive terminal on input 2 and connect the negative terminal on input 1 to the negative terminal on input 2. Short lengths of
10.CH1/CH2, Low Impedance Speaker Outputs
The amplifier direct speaker outputs bypass the internal constant voltage transformers and are used for direct connection to loudspeakers. The amplifier will operate into 2, 4, and 8 Ω loads. The use
of appropriately sized spade lugs is recommended for speaker wire termination; connect the speaker line common to the
For high power applications, use the proper gauge wire for the speaker connections. Contact Atlas Sound Tech Support
11.CH1/CH2, 25/70.7/100V Speaker Outputs
The amplifier will drive constant voltage speaker loads for use in commercial business music/paging systems and sound masking systems. The use of spade lugs for terminating and connecting the speaker home runs is recommended. The speaker line common connects to the “0” terminal and the positive lead connects to the desired voltage for required system requires for proper operation (Figures 8,9,10; Pages
Calculating Constant Voltage Loads
To calculate the maximum quantity of transformer coupled loudspeakers you can safely connect to the amplifier, first add up the total number of speakers that will be connected to one channel of the amplifier, then multiply that total speaker number by the tap setting you plan to use. The result will be the load in watts that the amp output channel will see. It is good engineering practice to leave a 20% margin below the maximum rated output power of the amplifier. In this case, one channel of the amplifier can supply 350 W of power at 70.7V. Derate this by 20%, leaving 280 W of power available for constant voltage speakers.
Specifications are subject to change without notice
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