Operation Manual
5. Operation and performance
20
C SERIES Operation Manual rev 3.0.0
5.4.5. Output Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) is a unique feature in C Series ampliers. It is used to select the maximum power
available on each output channel. Four levels can be set using the DIP-switches on the amplier’s rear panel.
V peak Vrms
141 100
118 84
100 70
85 60
71 50
59 42
50 35
42 30
The values for VPL are displayed as maximum Voltage Peak. To translate Voltage Peak into Vrms, you must divide
the Voltage Peak values by 1.41 (see table).
The VPL allows you to set the correct maximum output peak power for optimum performance with the connected
speakers. The correct setting depends on the system type (low or high impedance) and the specic load
connected to the channel. Since each channel can be congured to deliver either very high voltage peak power
OR high current draw at low impedances, it is important to set the VPL correctly.
To congure an individual output channel for a constant voltage system, you simply adjust the DIP-switches to
the desired voltage. However, when using an output for a low-impedance system ( 4, 8 or 16 ohms), then you
may need to adjust the VPL to a lower setting to avoid either delivering excessively high continuous power to the
speaker or overheating of the output channel through high current draw. For example, with a very “hot” continuous
output signal, the temperature could rise to a critical level and activate Temp warning or even Temp Mute. Lowering
the VPL setting usually will solve this situation.
If the Current Peak Limiter is active or indicates low impedance, lowering the VPL setting can rectify this situation
as well.
5.4.6. Constant voltage 70 V and 100 V systems setup and operation
When using C Series ampliers to drive constant voltage (high-impedance) speaker systems at 70 Vrms or 100 V
peak, you can in most cases simply connect the speakers to the amplier output terminals, select the correct VPL
setting, and place the amplier in service.
5.4.8. Output Current Peak Limiter (CPL)
The Current Peak Limiter (CPL) ensures that the amplier will not be damaged by trying to deliver current to the
outputs exceeding the physical limitations the transistors. The CPL keeps the amplier within the Safe Operating
Area. The CPL is non-adjustable and has different limit values depending on model type. The maximum output
current values for the four C...X models are: