Electro-Voice Contractor Precision CPS4.5 Owner's Manual page 9

PARALLEL
In PARALLEL mode, the inputs of channel A and channel B are directly electrically linked. The audio signal has to be applied
to the input connectors of channel A. Using the input level controls to independently control the amplification of the two
channels is still possible because only the channels' inputs are linked. PARALLEL operation is the mode of choice, whenever
the same input signal drives multiple power amp channels of a large system installation, e.g. when driving massive bass
arrays.
Illustration 2.2: Audio signal applied to input A connector in PARALLEL mode
CAUTION:
In PARALLEL mode, the input signal has to be fed to input channel A only.
BRIDGED
In BRIDGED mode both amp channels work in push-pull operation to provide doubled output voltage. The audio signal has to
be applied to the input connectors of channel A, amplification is set via input level control of channel A only. BRIDGED
operation is the mode of choice, whenever high power speakers are used.
Illustration 2.3: Audio signal applied to input A connector in BRIDGED mode
CAUTION:
In BRIDGED mode operation, it is not allowable for the load connected to fall below a value of
4 ohms. Extremely high voltages can be present at the output. The connected speaker systems
must be able to handle such voltages. Make sure to completely read and fully observe power
rating specifications of the speaker systems to be used and to check them against the output
power capacity of the power amp.
OUTPUT
CPS 4.5
CPS 4.10
CPS 8.5
2 Ω 4 Ω
4 Ω 8 Ω 1000 W at 140 V (≈20 Ω)
4 Ω 8 Ω 2000 W at 140 V (≈10 Ω)
4 Ω 8 Ω 1000 W at 140 V (≈20 Ω)
Table 2.2: Minimum load in BRIDGED mode
CONTRACTOR PRECISION SERIES
70 V
1000 W at 200 V (≈40 Ω)
2000 W at 200 V (≈20 Ω)
1000 W at 200 V (≈40 Ω)
100 V
Owner's Manual 9