Coda C475 Guia do Utilizador descarregar pdf (Página 6)

6 C745 User Guide Version 1.0

The C-Series introduces three user-controlled features previously not seen on Coda Audio amplifiers:

 Bar LED level indicators on the front panel.

 Power reduction control (PRC)

 User-settable gain/sensitivity (internal)

Power Reduction Circuit (PRC) and Impedance Sensing

There are two PRC circuits in the C475: one for channels A & B and one for channels B & C. When

the amplifier is to be used with 4 Ohm speakers (or bridged mono into 8 Ohm) or if you want to

reduce the maximum power to protect the speakers, then the PRC can be selected via the switches

on the rear panel.

Whenever an audio signal of medium amplitude is present on any channel and, if the speaker

impedance on any of the channels is less than 5.5 ohms, then the Automatic Impedance Sensing

circuit will set that pair of channels to the 4 Ohm position.

Connections

Note that all amplifiers before serial number 7E70004 have a different wiring configuration for

the input and output sockets. This will only affect the “linked” or “bridged” modes of operation.

Inputs

The inputs are made via 3-pin XLR connectors, which are electronically balanced and should be

connected via a high grade twin core screened cable, as follows:

Pin 1 Screen (see note) Pin 2 +ve signal (hot) Pin 3 -ve signal (cold)

Note: +ve and –ve denotes the phase of the signal

The amplifier is designed to operate with fully balanced equipment and ground loops or loss of

performance may be experienced if connected to unbalanced sources. If it is unavoidable however,

the following wiring should be used. The cable should still be twin core plus screen.

Pin 1 - Screen - connected to the chassis of the unbalanced equipment - or left disconnected at

the unbalanced end.

Pin 2 - +ve signal

Pin 3 - -ve signal

1 2 3 4 5 6 7 8 9 10 11 12

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Coda C475 Guia do Utilizador Página 6