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Summary of Contents for XTA C2
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Page 2: C2 Quick Reference
C2 Quick Reference THINGS YOU NEED TO KNOW… ü BOLD MEANS HOLD! Any functions that would produce possible unexpected level changes at the outputs are protected by a ‘press and hold’ action and printed in BOLD on the panel. These... -
Page 3: Table Of Contents
Contents C2 Quick Reference Important Safety Information Thanks Unpacking the C2 Introduction Features Front Panel Familiarisation Rear Panel Connections Operating the C2 Switching the unit on and start-up procedure Press-and-hold Keys Minimum and maximum control positions Compression – What It Is and What It Can Do... -
Page 4: Important Safety Information
In the USA the cord should comply with the requirements contained in the Standard for Cord Sets and Power Supply Cords, UL 817, be marked VW-1, and have an ampacity rating not less than the marked rating of the apparatus. Page 4 C2 Operators Manual... -
Page 5: Thanks
Thanks Thank you for choosing the XTA C2 Dual Compressor for your application. Please spend a little time reading through this manual, so that you obtain the best possible performance from the unit. All XTA products are carefully designed and engineered for cutting-edge performance and world-class reliability. -
Page 6: Introduction
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. -
Page 7: Front Panel Familiarisation
The [-60uS] setting uses ‘look-ahead’ delay to preempt the signal going over the threshold and so prevents any overshoot. Release Control: Adjust how quickly the gain reduction decreases once the signal drops below the threshold again. C2 Operators Manual Page 7... - Page 8 STEREO Key: Enabling the ‘Stereo’ mode will disable the right hand set of controls and force both channels to assume the parameter values of the left channel. The sidechains are also linked so that the two channels track perfectly, maintaining the stereo image. Page 8 C2 Operators Manual...
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Page 9: Rear Panel Connections
Audio In-Out: 3 pin XLR sockets are provided for each channel. All are fully balanced, pin 2 hot, 3 cold, 1 screen. Always replace the fuse with the correct type and rating as shown on the rear panel legend. C2 Operators Manual Page 9... -
Page 10: Operating The C2
Operating the C2 Operation of the C2 is very straightforward, but there are a few points worth noting which, once understood, will make using the unit even easier. Switching the unit on and start-up procedure After plugging in the power and switching the power on suing the rear panel switch, confirmation is quickly given that all is well by various status LEDs illuminating almost immediately after power-up. -
Page 11: Compression - What It Is And What It Can Do
‘Limiting’, and is the responsibility of the Limiter Module also in the C2. The method by which a compressor limits the maximum level is performed in a more gradual way so as to gently control the dynamic range, rather than dramatically ‘cap’... -
Page 12: How Does A Compressor Work
It’s value can have a profound effect on the transparency of the compressor – that is, how natural it sounds and how noticeable its action appears. Page 12 C2 Operators Manual... -
Page 13: What Makes The Xta Compressor Different
(or external key), tying up a valuable resource in the process. the C2 ’s compressor has a band of fully featured parametric equalisation built into the sidechain. Each band can be swept from 20Hz to 20kHz and is selectable as either a parametric filter, or a shelving filter. -
Page 14: C2 Configurations
C2 Configurations There are two distinct modes of operation of the C2 - normal compressor mode (augmented by a sidechain equaliser section), and the De-EQ mode. To explain the operation of these two modes and clarify the differences between them, they will be broken down into building blocks, which are connected differently in the two modes. - Page 15 Note that the digital output is a factory fitted option – please see Appendix 1 for further information about this. Now that the main building blocks have been explained, their interactivity and connections can be outlined with reference to the two modes of operation. C2 Operators Manual Page 15...
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Page 16: Compressor Mode
– and all frequencies are reduced in gain by the same amount. This is known as ‘broadband compression’. The introduction and use of the sidechain EQ adds the facility to make this ‘frequency conscious’. Page 16 C2 Operators Manual... -
Page 17: De-Eq Mode
The crucial part is following the gain control element. The filtered signal is now inverted so that, when it is re-combined with the other signal, it will cancel out some of the overall level around the selected band, so compressing just those frequencies. C2 Operators Manual Page 17... -
Page 18: Sidechain Equalisation - How And When To Use It
The solution to this problem is to introduce some complementary sidechain EQ that will remove some of the offending bass from the control signal, making the compression more ‘even-handed’ again. The required effect on the spectrum would be similar to that shown below. Page 18 C2 Operators Manual... -
Page 19: How Would Sidechain Eq Normally Be Implemented
How would sidechain EQ normally be implemented? Typically, sidechain EQ would be patched into the in/out external path as offered by the dynamics processor. The C2 obviates the need for this external processing for any of the dynamics modules. C2 Operators Manual... -
Page 20: Why Is The De-Eq Mode So Useful
Try de-essing with the filter centred at 8-9kHz, and a narrow bandwidth setting, attack 25mS, release 100mS. Page 20 C2 Operators Manual... -
Page 21: Look Ahead Delay - Pre-Emptive Action
XTA would like to point out that whilst the C2 might ‘sound’ male, not all engineers are necessarily male. Some might well be female, or at least have long hair. - Page 22 The C2’s ability to predelay the sidechain allows it to predict what will be appearing in the main signal path and react before the signal arrives, thus preventing the overshoot seen above.
- Page 23 Note that the C2 does not have to use this look ahead delay – in many cases, it is preferable to allow the overshoot. For example, compressing percussive instruments where the overshoot retains a degree of the original high frequency energy, stopping the sound from becoming lifeless and dull.
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Page 24: Setting The Attack And Release Times
Without the inclusion of a knee control, at the threshold of gain reduction, a sudden transition occurs between unity gain and the ratio by which the compressor attenuates. When using high compression ratios, the use of a hard knee can result in a very unnatural sound. Page 24 C2 Operators Manual... - Page 25 This shows on the graph as a flattening at the threshold, rather than a sharp bend. The C2 offers three preset knee settings: Hard Knee: Compression begins immediately the threshold is exceeded, at the full ratio setting. Medium Knee: Compression begins 6dB below the threshold at half the set ratio, and reaches full ratio 6dB above.
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Page 26: Using The Auto System
The AUTO system is further supplemented by the C2’s ability to prevent combinations of attack and release times that would cause distortion when large amounts of gain reduction are being applied to the signal. -
Page 27: Operating Notes
Provision is also made for separately isolating each input and output shield pin permanently within the C2 by breaking the appropriate PCB track, where marked with a box and an arrow next to each XLR connector using a small drill bit or cutter. -
Page 28: Specifications
Centre/corner Freq: 20Hz to 20k Gain: +6,9 or 15dB and ‘Off’ Sidechain monitor available. Options u = Transformers available. Optional Interfaces AES/EBU Digital Input/Output Due to continuing product improvement the above specifications are subject to change. Page 28 C2 Operators Manual... -
Page 29: Warranty
This warranty is exclusive and no other warranty is expressed or implied. XTA is not liable for consequential damages. Options and Accessories Part Number Part Description ITX-100 C2 Transformer balanced inputs (factory fitted only) OTX-100 C2 Transformer balanced outputs (factory fitted only) AES-C2 AES/EBU Digital inputs/outputs (factory fitted only) C2 Operators Manual...
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