Coda Audio C25 Power Amplifier User Guide version 1.
Contents EC Declaration of Conformity Important Safety Instructions Installation Electrical Mechanical EMC (RF Emissions) Features 3 4 4 4 5 5 5 -3 dB Indicators PRC Gain/Sensitivity Settings 6 6 6 Level controls Bar Signal indicators -3dB indicator Limiters PRC indicators Temperature control Fault indicators Bridged LED 8 8 8 8 8 8 9 9 Introduction Connections Inputs Outputs Bridged Operation Link Socket Operation Switching on Panel Controls and Indicators Maintenance Technical Specification Power r
C25 User Guide Version 1.
Important Safety Instructions 1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. 4) Follow all instructions. 5) Do not block any ventilation openings and install in accordance with the manufacturer’s instructions. 6) Unplug this apparatus during lightning storms or when unused for long periods of time. 7) Clean only with a dry cloth.
To avoid electrical shock do not remove covers. Refer all servicing to qualified personnel. Do not use the unit if the electrical power cord is frayed or broken. The power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords and plugs and the point where they exit from the appliance. Always operate the unit with the AC ground wire connected to the electrical system ground.
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.
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 -) For Unbalanced Inputs 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.
Bridged (Mono) Operation Use centre Speakon connector marked ‘BRIDGED’ and connect as follows: For bridged operation: Pin Pin 12+ For 4-pole connection to both channels: (Bridged switch de-selected [ie Out]) Pin 1+ Pin 1Pin 2+ Pin 2- = = -ve (Ch A) +ve (Ch B) = = = = Ch. A +ve Ch. A -ve Ch. B +ve Ch. B -ve When operating in bridged mode, the minimum impedances are doubled. The minimum load in bridged mode is: 4 Ohm.
Normal dynamic signals will not cause the amplifier to overheat unless the ventilation is inadequate. (See installation section and maintenance section.) Fault Indicator (Audio Protection – red LED) If the outputs are shorted or if DC is present, the protection circuit will disengage the outputs and the A/P LED will illuminate.
Technical Specification Output power (Watts RMS) per channel 8 Ohm @ 1 kHz 4 Ohm @ 1 kHz 2 Ohm @ 1 kHz 650 1250 2200 8 Ohm @ 1 kHz 4 Ohm @ 1 kHz 2500 4400 4 Ohm 1 kHz 20 Hz-20 kHz <0.008 % <0.03 % Mono Bridged THD @ rated power Input CMRR >90 dB Hum & Noise -105 dB Gain (selectable) +32 dB/+26 dB/+33 dB Sensitivity for rated output (4 Ohm) +7 dBu/+13 dBu/+6 dBu (1.5V) Damping Factor 1 kHz, 8 ohms >400 Frequency response 20 Hz-2 0kHz +0/-0.
Appendix Table of PRC settings and resulting Output Output per Channel (Watts) Bridged Mode (Watts) Max Power into 4 Ohm -2 dBu PRC Setting -4 dBu PRC Setting -6 dBu PRC Setting 1250 800 525 350 4400 2800 2000 1300 Max Power into 8 Ohm -2 dBu PRC Setting -4 dBu PRC Setting -6 dBu PRC Setting 680 430 280 180 2500 1600 1050 700 Max Power into 2 Ohm -2 dBu PRC Setting -4 dBu PRC Setting -6 dBu PRC Setting 2200 1400 1000 650 N/A N/A N/A N/A C25 User Guide Version 1.
Coda Audio GmbH Boulvard der EU 6 30539 Hannover Germany Phone: +49 (0) 511 – 866 55 888 Fax: +49 (0) 511 – 866 55 887 E-Mail: contact@codaaudio.com Website: www.codaaudio.
