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C2

 Operators Manual 

Introduction  

 

 

 

 

 

 

 

 

 

 

The 

C2

 is a powerful DSP based audio dynamics processor, ideally suited for live 

sound applications, where it combines the accessibility and immediacy of a pure 

analogue design with the quality and accuracy of a digital design in a compact 1U unit.  
To achieve this, the 

C2

 has an analogue control surface, following the ‘one control – 

one function’ philosophy and a pure digital signal path, with 24-bit conversion, 40-bit 

internal processing and a professional 48kHz sampling rate. 
 
The 

C2

 is also available with optional AES/EBU digital inputs and outputs. 

 

Features 

 

 

Look ahead attack available on the compressor for instantaneous 

control of transients 
 

 

Automatic time constants which are intelligently adjusted depending on 

the setting of other controls (namely the sidechain EQ frequency when in 

De-EQ mode) 
 

 

Sidechain EQ built-in for the compressor - switchable to lo/hi shelf 

and wide/narrow parametric, with variable stepped gain and high-resolution 

frequency adjustment. 
 

 

De-EQ mode - an extension of traditional De-Essing where the sidechain 

filter band not only affects the sensitivity of the compressor at certain 

frequencies, but also only compresses around those frequencies. 
De-Essing, and De-Popping, and any other band reduction in power as 

required. 

 

 

Digitally accurate metering with indication of closeness to compression 
threshold. 

 

 

Independent limiter section with metering. 

 

 

Stereo mode, where both channels are linked and track 100% accurately. 

 

 

AES/EBU Digital input and output interfaces are available as an option. 

 

 

Input and output balancing transformers are also available as an option. 

Содержание C2

Страница 1: ......

Страница 2: ...he meters show level in dB from the clipping point of the unit when the METER switch is set to IN the meters show level in dB from clipping the input converter Set to OUT they show headroom available...

Страница 3: ...How does a Compressor work 12 What makes the XTA Compressor different 13 C2 Configurations 14 Compressor Mode 16 DE Eq Mode 17 Sidechain Equalisation How and When to Use it 18 When would Sidechain EQ...

Страница 4: ...E CHOC ELECTRIQUE NE PAS ENLEVER NE PAS EXPOSER A LA PLUIE NI A L HUMITE It should not be necessary to remove any protective earth or signal cable shield connections Do not defeat the purpose of the p...

Страница 5: ...d and engineered for cutting edge performance and world class reliability If you would like further information about this or any other XTA product please contact us We look forward to hearing from yo...

Страница 6: ...which are intelligently adjusted depending on the setting of other controls namely the sidechain EQ frequency when in De EQ mode Sidechain EQ built in for the compressor switchable to lo hi shelf and...

Страница 7: ...to 16 1 very heavy compression Knee Key Cycles through Hard knee compression begins at the selected ratio as soon as the threshold is exceeded Medium compression is less pronounced just above threshol...

Страница 8: ...shelf mode LISTEN Key Switches the output of the sidechain filter into the main signal path so that the required range of frequencies may be more easily selected LED flashes as a reminder that this is...

Страница 9: ...proof holder adjacent to the mains inlet A spare fuse is also located in this holder Mains Inlet connected via a standard IEC socket Audio In Out 3 pin XLR sockets are provided for each channel All ar...

Страница 10: ...er to the fact that several keys require a press and hold action to initiate them These keys relate to functions that could accidentally introduce large changes of level at the outputs causing undesir...

Страница 11: ...are connected together to record the CD for example the unit with the lowest dynamic range sets the dynamic range for the entire system In the example above the dynamic range available is limited to...

Страница 12: ...l has risen very sharply hence the sudden jump to a level above the threshold This signal is potentially too high and must be reduced in level to a more acceptable value The difference between the ori...

Страница 13: ...is able to look ahead and anticipate peaks before they occur This gives it the ability to prevent the overshoot that is unavoidable with analogue compressors In this way the compressor behaves in a m...

Страница 14: ...in EQ Sections The signal used for controlling the main path may be equalised prior to its use as a control signal this enables it to be made more or less sensitive to certain frequencies changing the...

Страница 15: ...ction meter which will show the instantaneous amount of compression being applied are the keys to matching the levels Limiter Module Separate to the compressor is a fully independent limiter module Th...

Страница 16: ...ignal may be monitored by engaging the LISTEN function In this mode the sidechain control signal may be equalised to make it more or less sensitive to certain frequencies This will in turn affect the...

Страница 17: ...st a band of frequencies but in De EQ mode these filters are only used to home in on a band to make the signal more sensitive in this area This filtered signal is then used to control the threshold at...

Страница 18: ...useful to be able to de sensitise the sidechain to certain frequency bands to prevent excessive activity at inappropriate times Maximising loudness without dulling the mix Loudness as opposed to volu...

Страница 19: ...more accurate control of the amount of bass removed The curve imposed by a high pass filter is shown in orange and that of a shelving filter in red This highlights the advantage to incorporating more...

Страница 20: ...frequency conscious compression is to control or tame a certain band of frequencies within the program material Insertion of EQ into the sidechain will make the compressor respond to the required band...

Страница 21: ...f one of the channels on his desk reach an unacceptably high level he will turn it down appropriately There is a hidden sidechain in operation even in this case The main signal path is fed through the...

Страница 22: ...the first peak above the threshold as it is very fast and short but has caught up shortly afterwards keeping all other peaks under control As it is unable to predict what is coming this will always be...

Страница 23: ...sor will achieve similar results but with the penalty of delaying the main signal by the amount of look ahead delay introduced Note that the C2 does not have to use this look ahead delay in many cases...

Страница 24: ...ortion if care is not taken with the settings The best way to ensure that the signal is not being excessively distorted is to make good use of the ACTIVE button constantly comparing the original signa...

Страница 25: ...above and 6dB below the threshold reducing the severity of the compressor This shows on the graph as a flattening at the threshold rather than a sharp bend The C2 offers three preset knee settings Ha...

Страница 26: ...peration is not made apparent by the unit s front panel controls it does go a long way to guaranteeing that the compression will never sound terrible Enabling the AUTO system by HOLDING the AUTO key w...

Страница 27: ...that option not a safe operating level Always ensure that this clipping point is no lower than that for the following equipment in the signal chain and allow extra margin if equalisation sections are...

Страница 28: ...helf or Narrow 0 83 Oct wide 1 25 Oct parametric response Centre corner Freq 20Hz to 20k Gain 6 9 or 15dB and Off Sidechain monitor available Limiters Threshold 10dBu to 22dBu Attack 1mS preset Releas...

Страница 29: ...service facility Defects caused by unauthorised modifications misuse negligence act of God or accident or any use of this product that is not in accordance with the instructions provided by XTA are no...

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