Coda Audio C475 Power Amplifier User Guide version 1.
Contents EC Declaration of Conformity Important Safety Instructions Installation Electrical Mechanical EMC (RF Emissions) General Information Power Reduction Circuit (PRC) and Impedance Sensing Connections Inputs 3 4 4 4 5 5 5 6 6 6 Input Link Switches 7 Level controls Limiters Level Indicators PRC indicators Temperature control Fault indicators 8 8 8 9 9 9 Outputs Operation Switching on Panel Controls and Indicators Maintenance Gain/Sensitivity Settings Air Filter Technical Specification 7 8 8 8 9
C475 User Guide Version 1.
Important Safety Instructions 1) 2) 3) 4) 5) 6) 7) 8) 9) Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not block any ventilation openings and install in accordance with the manufacturer’s instructions. Unplug this apparatus during lightning storms or when unused for long periods of time. Clean only with a dry cloth.
Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. Do not remove the lid. Removing the lid will expose you to potentially dangerous voltages. There are no user serviceable parts inside. Mechanical To ensure that this equipment performs to specification, it should be mounted in a suitable rack or enclosure as described below.
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.
Note: This amplifier is wired to the latest industry recommendations. PIN1 is connected directly to the chassis/mains earth. If ground loops (mains hum) are encountered remove the screen connection from the other end of the cable and leave it open circuit. If problems persist, consult your dealer/supplier. Do not tamper with or alter any ground (earth) connections inside the amplifier. For bridged operation use channels A & B (or C & D). Inputs should be connected to channel A (or C).
Note: 1. Negative (-ve) output terminals must not be joined together, since they are not both at 0V. 2. Because the currents involved are very high, the speaker cables should conform to the following minimum requirements, otherwise the losses will cause the cables to get hot and audio power will be reduced: C475 - 14 A into 4 Ohm speaker loads. 3.
PRC Indicators (green LED) These indicate when the PRC circuit, for the specific pair of channels, has been selected. (Either manually via the switches on the rear panel or automatically via the impedance sensing circuit) Temperature Control The cooling fans respond to temperature sensors within the unit to maintain a safe operating temperature. In the event of excessive temperature, the protection circuit will operate, disabling the output. The red ‘AUDIO-PROTECT’ (A/P) LED will indicate this condition.
Air filter The filter behind the air intake apertures on the front of the C475 amplifier should be cleaned or replaced periodically, e.g. 3-6 months. (Filters in amplifiers located in more 'dirty' atmospheres may require more frequent maintenance.) Access is via the blue front panel. The filter should be 'dry' cleaned, using a vacuum cleaner preferably. Running the unit without a filter is not recommended unless it is within a 'clean room'. Replacement filter material is available.
Technical Specification Output power (Watts RMS) per channel 8 Ohm @ 1 kHz 4 Ohm @ 1 kHz 750 825 THD @ rated power 8 Ohm 1 kHz 20 Hz-20 kHz <0.006 % <0.03 % Input CMRR >70 dB Hum & Noise -105 dB Gain (selectable) +32 dB/+26 dB/+31 dB Sensitivity for rated output, 4 Ohm +5 dBu/+11 dBu/+6 dBu (1.5 V) Damping Factor 1 kHz, 8 Ohm >400 Frequency response 20 Hz-20 kHz - +0/0.5 dB Input impedance (actively balanced) 20 kOhm Dimensions (mm) - 2U 88 x 482 x 428 Weight 10.
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.
