Coda C45 Betriebsanweisung PDF herunterladen (Seite 6)

6 C45 User Guide Version 1.0

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

 -3 dB indicators

 Power reduction control (PRC)

 User-settable gain/sensitivity (internal)

The latest version now also has improved signal level indication with 3 green LEDs in a ‘bar chart’

format. This gives a much clearer indication of level to the operator. The -3 dB and Limit LEDs

continue the bar format.

-3 dB Indicators

Part of the front panel signal level display, they will light up when the signal is approximately 3 dB

below the limiting point. The limiting point is set during production to be at the onset of clipping. The

response times of the -3 dB indicators (YELLOW) are faster than those of the limit indicators

(ORANGE).

Power Reduction Circuit (PRC)

This enables the user to set a maximum output power level below the rated output of the amplifier.

This reduction is controlled by switches on the rear panel, 2 per channel. Each channel has an LED

indicator (GREEN) active when either PRC switch is selected. A full table of PRC settings and the

resulting outputs are given in the Appendix. The possible settings are: -2 dB, -4 dB, -6 dB. This relates

to the maximum output of the amplifier. (See the chart in the Appendix section at the end of this

manual.)

In bridged mode the Channel A PRC circuit operates over both Channel A and B. In this mode

Channel B PRC is not used and is out of circuit.

Notes on Dynamic Amplifiers

The C45 is the very latest example of a ‘dynamic amplifier’. This new ‘breed’ of power amplifiers

provide very high peak power levels in a much smaller, and lighter, package than previously possible

with conventional amplifiers. They are designed specifically for today’s high power audio installations,

which use multiple speakers with electronic crossovers or speaker controllers. These systems can

handle very high transient signals which far exceed their RMS power rating. The C-Series amplifiers

have been designed to match this requirement and can deliver huge levels of power for short

durations (just under a second). In order to protect themselves and the loudspeakers that they are

driving, continuous signals, such as sine waves, are automatically detected and reduced (ramped

down) to a safe level. When trying to measure the power output however, continuous signals will

give totally incorrect results. A dynamic signal, such as a tone burst, should be used and the levels

measured by monitoring the waveform on an oscilloscope. The power envelope can then be

accurately measured.

Connections

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:

PIN1 - Screen (see note)

PIN2 - Hot (signal +)

PIN3 - Cold (signal -)

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Coda C45 Betriebsanweisung Seite 6