Electro-Voice CP-Series Power Amps CP1800, Owner'S Manual

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INPUT A / INPUT B

  The inputs INPUT A & INPUT B are electronically balanced 

  offering input sensitivity of +4dBu (1.23V) for direct 

  connection of mixing consoles, signal processors, etc.  

The XLR-type connectors OUTPUT A & OUTPUT B are pre-

pared for „through-connecting“ input signals to additional ex-
ternal power amps. The input signal is directly routed to these 
output connectors. There are no repeaters or other electronic

 components within that signal path. Accordingly, input and output connectors of the corresponding 
 channel are interconnected in parallel, offering permanent electrical connection, without regard to the
 setting of the Power-ON switch.

NF-CONNECTION CORDS

Choosing high-quality balanced cables (two conductors for the audio signal plus separate shielding 
mesh) with XLR-type connectors is recommended for LF-signal connection. Although connecting un-
balanced cables to the power amplifier inputs is possible as well, using balanced cables is always pref-
erable. A great number of today’s audio appliances employ balanced outputs. With balanced cabling, 
the shield connects all metal enclosure parts and therefore efficiently eliminates the introduction of 
external interference – mostly noise and hum.

XLR-

type connector pin-assignment

XLR (male) 

       XLR (female)

PARALLEL 

The input connectors of channel A and channel B are electrically connected 
in parallel when the selector switch is set to PARALLEL. However, individually 
controlling the volume of both channels is still possible via the corresponding level 
controls A and B.

DUAL 

If the selector switch is set to DUAL, the audio signals of channels A and B are     
independently amplified.

REAR PANEL

Although having XLR-type output connectors, some mixing console models provide unbalanced 
output connection only. When using mixers with unbalanced outputs, bridging PIN1 and PIN3 
of the power amp’s input connectors or leaving PIN3 of the cable’s plugs unconnected is 
necessary. Otherwise, when feeding in unbalanced audio signals via PIN3 (b, -, „cold“) and PIN2 
(a, +, „hot“), strange humming and HF-interference may occur, which very likely will damage the 
power amplifier and/or the connected speaker cabinets.