Coda Audio C5 DSP amplifier User Guide version 1 1
Important Safety Information Please read carefully and keep the following instructions and safety information. Heed all warnings and follow all instructions. • Do not remove covers. There are no user serviceable parts inside; please refer servicing to qualified service personnel. • This equipment must be earthed. • Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles and the point where they exit from the apparatus.
Table of Contents Important Safety Information .................................................................................................. 2 Regulatory Compliance .................................................................................................... 2 Thanks and Unpacking ............................................................................................................ 5 Introduction and Key Features .............................................................................
EQ and Filter Response Graphs .............................................................................................. 27 Signal Processing Block Diagram ........................................................................................ 30 Technical Specifications .....................................................................................................
Thanks and Unpacking Thank you for choosing a Coda Audio C5 DSP amplifier system for your application. Please spare a little time to study the contents of this manual, so that you obtain the best possible performance from this unit. All Coda Audio products are carefully engineered for world-class performance and reliability. If you would like further information about this or any other Coda Audio product, please contact us. We look forward to helping you in the near future.
Introduction and Key Features Introduction The C5 DSP amplifier systems from Coda Audio integrate light-weight power supplies, high power sonically transparent class D amplifiers, complete system monitoring and a fully featured USB or network controlled 24 bit 96kHz DSP processing platform as standard.
Mechanical Installation The C5 DSP amplifier system is designed to be mounted in a standard 19” rack enclosure. Where the amplifier is used in a fixed installation, it is possible to use only the front panel 19” rack mounting holes to mount it in a standard rack enclosure.
the amplifier can be well supported. Damage caused by insufficient support is not covered by the warranty. To prevent damage to the front panel it is recommended that plastic cups or washers are fitted underneath the rack mounting bolt heads. It is possible to mount multiple C5 amplifiers without ventilation gaps between them but it is essential that an unobstructed flow of clean air is available from the back of the unit to the front.
AC Power Connection WARNING! THIS APPLIANCE MUST BE GROUNDED. The amplifier must always be connected using a 3-wire, grounded AC supply. The framework of the rack mount enclosure should also be connected to the same grounding circuit. The unit should never be operated unless the AC power cable ground is correctly terminated; this is important for personal safety and for control of the system grounding. The amplifier is supplied with a Neutrik PowerConTM type locking AC power connector.
Audio Connections For each amplifier channel there are female and male XLR input connectors which are wired in parallel. Typically the female connector is used for the audio input, the male XLR connector being available to link the same audio signal to another amplifier channel. The HOT, + or ‘in phase’ connection should be made to pin 2 of the XLR connector. The COLD, - or ‘out of phase’ connection should be made to pin 3 of the XLR connector.
Using unbalanced connections When connecting the C5 amplifier to an unbalanced audio source, the signal conductor should be terminated to XLR pin2 and the cable screen terminated to both pins 1 and 3. In bridged mode output channel 1 signal chain provides the signal for the 1 & 2 pair of amplifier channels, output channel 3 signal chain provides the signal for the 3 & 4 pair. Amplifier output connections The C5 amplifier is fitted with one SpeakonTM connector per amplifier channel.
More than one speaker can be connected to each channel provided the total impedance per channel is not less than 2 ohms. In bridged mode the minimum total impedance should not be less than 4 ohms. 100V line operation A single channel of an C5 can deliver 1250W in to 2 Ohms, therefore the RMS voltage at the speaker terminals when delivering this will be √(1,250 x2) = 50V.
Front Panel Power Switch The C5 amplifier is fitted with either one or two dual channel power modules. As the power modules operate independently there is a separate power switch for each. When the power switch is operated, the protect indicator will flash while the DSP and amplifier control systems are prepared. After approximately 3-4 seconds the amplifier will be operational and the audio level is gradually ramped up. Power ON indicator Each Power Switch is associated with a POWER indicator.
Protect The C5 DSP amplifier system has sophisticated protection and monitoring systems which keep the amplifier within its safe operating window whenever possible. This indicator lights when the protection systems are active in any way. User DSP indicator Using the C-Net PC application the user can introduce audio processing such as EQ, gain and delay. These settings can be bypassed using the User DSP settings defeat button. The indicator will be lit when these DSP settings are in use.
Rear Panel Power Inlet The C5 amplifier should be connected to a suitable mains electricity supply using the cable supplied. The unit uses auto ranging switch mode power supplies which are capable of operating with a nominal mains voltage of either 115V or 230V, 50/60Hz without reconfiguration. Audio Input Connectors All audio connections are fully balanced and wired pin-1 ground, pin-2 hot & pin-3 cold. The two inputs have pin-1 connected directly to the chassis and feed the signal processing chains.
Or alternatively, if you want to have one cable feeding two speakers, use Speakon 1 (or 3) pins 1+ and 1- for the first speaker, and pins 2+ and 2- for the second speaker. For Bridge operation, use Speakon 1 (or 3) pins 1+ and 2+ (1+ for Speaker + and 2+ for speaker -) Communications Port Connections Coda Audio C5 DSP amplifiers may be controlled and monitored using the C-Net PC application.
Cat5 cable. If you are using USB to connect to the C-Net Interface, then the Interface will usually power itself via USB. However, if you are using RS232, or if you are using an unpowered USB hub, or you have some network powered C-Net network equipment in the network, then you will need to use an Accessory Power Supply to power the Interface. The Aux In socket may be used to select between a number of ‘Voices’ that may have been programmed into the C5 using factory files (*.dfa) supplied Coda Audio.
This section of the user guide explains the functions of the C-Net control panel for the C5 DSP amplifiers. For further help and information on the main C-Net application please click on the help button on the main application. For more detailed help about the C5 control panel, click the “?” in the right-hand corner of the C5 control panel in C-Net. Amplifier Channels It is important to realize that each two channel amplifier section contains its’ own DSP.
Monitoring Section (MonIcon) This allows you to view what is going on inside the amplifier at a glance.
tab of the C-Net control panel. This locks the amplifier into the User Voice regardless of the setting of the push button. Also see Loading Factory Presets and Aux In Port Main Control Panel The Input area allows you to adjust the input sensitivity of each input of the amplifier, and to change the polarity of each input, allowing you to reverse the phase of the loudspeakers fed from that input. The Output section allows you to control the output drive level of each amplifier.
The Properties/Options tab contains some properties of the amplifier. Here, you can enter a name for the amplifier (such as “Left Fill”). Also viewable in this tab are the model name of the amplifier, and the name of the settings provided by Coda Audio of the factory file. The Maintenance area shows some details of how the amplifier has been used and the amount of protection the amplifier is applying. The Logs area contains graphs of events against time, recording events over a period of up to three days.
Hidden Controls Coda Audio may have hidden some of the controls on the panel in order to maintain proper protection of the connected loudspeakers. Such hidden controls will appear grey and cannot be adjusted. Saving & Recalling Data Device Data may be saved to disk or opened from disk. C-Net Device Settings files (with file extension .dse) contain all the data necessary to restore a device to exactly the same state as when the file was saved.
For further information on loading factory settings, please refer to the C-Net application main help. Tool Bar The toolbar provides the following one-click functions: Open Opens a file which contains parameters for the device. A dialogue will appear, inviting you to choose a file to open. Save Saves the current settings. A dialogue will appear inviting you to enter a file name.
PgDown Reduce value (coarsely) Up/Right arrow Increase value (finely) Down/Left arrow Reduce value (finely) On push-button controls: Space Activate Audio Processing The Digital Signal Processor (DSP) within the amplifier does all the necessary processing (such as crossover filtering, driver equalization and power limiting) for the loudspeaker to give you a solution which operates well in most circumstances without the need for further user adjustment (apart from gain).
A 2nd order high-shelf filter with frequency variable over the range 10Hz to 25kHz, and boost/cut from –15 to +15dB, and slope from 6 to 12dB/Octave. Eight bands of parametric equalizer, each band having frequency variable over the range 10Hz to 25kHz, bandwidth variable from 0.18 to 5.6 octaves (Q 0.15 to 8.1), and boost/cut from –15 to +15dB. Delay adjustable up to 90ms. Adjustable input gain from –30 to +15dB, mute and polarity. Adjustable output gain from –30 to +15dB.
Protection Comprehensive protection features preserve the longevity of the loudspeaker and amplifier by continuously monitoring several critical parameters, and reducing the gain, or muting the amplifier either temporarily or permanently depending on the nature and seriousness of the fault or misuse. The amplifier will recover and restart if at all possible, but may remain in shut down if a serious fault persists.
EQ and Filter Response Graphs The following plots show the attenuation characteristics of the various crossover filters available within the C5. These are all shown at a crossover frequency of 1kHz. Butterworth 6 Magnitude, dB 0 6 12 18 24 30 36 100 1 .10 Frequency, Hz 3 1 .10 4 6dB/Oct 12dB/Oct 18dB/Oct 24dB/Oct 48dB/Oct Linkwitz-Riley 6 Magnitude, dB 0 6 12 18 24 30 36 100 1 .10 Frequency, Hz 3 12dB/Oct 24dB/Oct 48dB/Oct 27 1 .
Bessel 6 Magnitude, dB 0 6 12 18 24 30 36 100 3 1 .10 Frequency, Hz 1 .10 4 12dB/Oct 24dB/Oct Hardman 6 Magnitude, dB 0 6 12 18 24 30 36 100 1 .10 Frequency, Hz 3 4th Order 8th Order 28 1 .
The following plots show the magnitude response (frequency response) characteristics of the various equalization filters available within the C5. These are all shown at a c frequency of 1kHz. Shelving EQ 15 Magnitude, dB 10 5 0 5 10 15 100 1 .10 Frequency, Hz 3 1 .10 4 Low shelf, varying Gain High shelf, varying Slope Parametric EQ 15 Magnitude, dB 10 5 0 5 10 15 100 1 .10 Frequency, Hz 3 Varying Gain Varying Bandwidth 29 1 .
Signal Processing Block Diagram Please note that each C5 contains two of these processing blocks, one for each pair of channels.
Technical Specifications AUDIO Input impedance 10k balanced Max Input level +20dBu Frequency Response 20Hz - 20kHz+/-0.5dB @ 4 Ohm load Output noise -106dB A weighted Ref max output, 22kHz BW Distortion <0.05% (1kHz, -3dB output.
Efficiency >90% typical POWER SUPPLIES Type High current, high freq.
Output power 2 bridged channels (RMS program, 20Hz-20kHz all channels driven) per bridged pair 2 x 1890W in to 4 Ohms 2 x 1210W in to 8 Ohms Output power 3 channels (RMS program, 20Hz-20kHz all channels driven) 2 x 945@2 Ohms + 1890W@4 Ohms 2 x 605W@4 Ohms + 1890W@4 Ohms 2 x 340@8 Ohms + 945W@8 Ohms Recommended minimum operating voltage 230V range 115V range 155V 80V Note that the range is automatically selected.
