Telex DN9848 Loudspeaker Processor, DOC02-DN9848 Monitoring the Input Signal, Compression

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Input Channels

5.2.5Compression (Page 14)

Each input has an independent full-range compressor to improve the dynamics of the incoming signal levels. The compressors are variable ratio and can be set to a hard knee characteristic for a sharp gain reduction response at the compression threshold, or soft knee for a more ‘musical’ response.

To set the compressor parameters

1On the first compressor menu page, use the centre knob to select a threshold value in the range –10dB to +21dB, and the right-hand knob to set a ratio from 1:1 to 5:1.

2Turn the left-hand knob clockwise to access the first sub-menu page. Use the centre knob to select a hard or soft knee characteristic and the right-hand knob to set the bypass state to ‘No’ so that the compressor is included in the signal path.

3Turn the left-hand knob clockwise to access the second sub-menu page. Use the centre knob to set the compressor attack time (range of 40 s – 1ms in 20 s steps or 1ms to 100ms in 1ms steps). Use the right-hand knob to set the release time (10ms to 2s in 10ms steps).

To switch the compressor out of the circuit

Set the bypass state on the second compressor page to ‘Yes’. The other settings are held for future use.

5.3. Monitoring the Input Signal

Each of the four inputs has a 9-segment signal meter for monitoring the internal signal clipping and compressor headroom or gain reduction.

The top CLIP segment monitors the internal signal clipping. It operates independently of the rest of the meter, lighting when signal clipping is detected at any stage in the processing circuits, regardless of whether the input level is above or below the compressor and/or limiter thresholds. Hence, the audio engineer has full visibility of internal signal clipping that may result in audio distortion.

The 0 to - 40 signal meter monitors the input level on a relative scale, where the 0 segment is set at the specified compressor threshold. For example, if the threshold is set to +9dBu then the input signal meter 0 segment is set at 9dBu true value, and a signal of –3dBu registers as 12dBu below the threshold (below left). Thus, when the signal level is below the threshold, the meter indicates the headroom.

When the signal level reaches the threshold, i.e. the red 0 segment lights, the meter ‘flips’ and reads downwards to show the amount of gain reduction applied to the signal.

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Contents Page Page Important Safety Instructions Page Declaration of Conformity Page Contents Technical Specification Installation Considerations Safety WarningAfter Unpacking Page Introducing the DN9848 DN9848 Key FeaturesFront Panel Controls, Connectors, IndicatorsRear Panel Navigating the DN9848 Menus Programming SettingsDN9848 Menu System DN9848 Programming PanelStore and Recall Set Up MenuHome DN9848 Menu Map Input Channels Setting Input ParametersInput Channels Brief Technical OverviewParametric Equalisation Pages 2 to Gain and DelayTo set the delay To adjust the gainTo set the compressor parameters Monitoring the Input SignalTo switch the compressor out of the circuit CompressionOutput Channels Output ChannelsRouting Setting Output ParametersTo access the Output menu pages for a particular channel Naming the Output ChannelTo set a precise phase shift at a reference frequency Signal Invert, Delay and Output LevelPhase Adjustment Pages 4 To invert the output signalTo bypass the high/low pass filter processing To apply a ‘shaped’ phase transition at a chosen frequencyHigh Pass and Low Pass Filters Pages 6 To add a high/low pass filter to output processingParametric Equalisation Pages 2 to To set the limiter parameters Monitoring the Output SignalTo switch the limiter out of the circuit Output LimiterOutput Gain and Mute Front Panel Control Remote Comms Channel Security and other Set Up OptionsSecurity Settings Pages 2 GeneralTo remove the Panel Lock When System Protect is onSystem Protect To set a Panel LockLCD Lighting To switch System Protect onTo switch System Protect off To adjust the lightingPower Up Options Delay OptionsTo change the units of measurement To lock the system memories, refer to .3 Security Settings Using the DN9848 MemoriesStoring and Recalling Settings To store settingsPress the black Recall button to access the Recall menu To recall stored settings from memoryDN9848 Remote Control Setup Remote Control SetupDN9848 Connection Laptop/PC Cable /Converter Required To disable remote controlRS-485 input to rear panel Advantage of DN9848 Look-Ahead Limiters Application NotesApplication Notes Application Notes Audio Precision Deg phase shift @ 20, 300, 1K, 20K 01/19/01 Phase-adjustment with the DN9848Audio Precision 1st order allpass @ 300, 1K, 10K 01/19/01 Technical Specification Technical SpecificationPower Requirements Factory Presets for X-Array Series Memory Out Identification P08 XI1122/85 4MIX R1-2 Memory Out Identification Factory Presets for X-Line Series Memory Out Identification

DOC02-DN9848, DN9848 Loudspeaker Processor specifications

The Telex DOC02-DN9848, commonly referred to as the DN9848 Loudspeaker Processor, is an advanced audio processing device designed to enhance sound quality in both live and recorded environments. With a sleek and modern design, the DN9848 is engineered to meet the demanding needs of professional audio applications, be it in concert venues, theaters, or broadcast studios.

One of the key features of the DN9848 is its comprehensive processing capabilities. Equipped with a powerful DSP (digital signal processing) engine, it offers extensive equalization options, dynamic range control, and advanced crossover functionality. The device utilizes up to 48 input and output channels, allowing for unparalleled flexibility in routing audio signals. This makes it ideal for installations that require precise control over multiple loudspeakers.

The DN9848 also boasts an intuitive user interface, which facilitates straightforward navigation through its various functions. The front panel features a large LCD display that provides clear visibility of parameters, and a selection of knobs and buttons enables easy adjustments. For remote operation, the device can be controlled via Ethernet, allowing technicians to make changes from virtually any location.

Another standout aspect of the DN9848 is its customizable algorithms that accommodate different speaker systems and acoustical environments. Users can fine-tune the processor to optimize performance for specific venues or loudspeakers. The device supports both FIR (finite impulse response) and IIR (infinite impulse response) filters, providing users with the flexibility to deploy advanced filtering techniques according to their needs.

The DN9848’s robust connectivity options further enhance its utility. It features standard analog XLR connectors, as well as digital interfaces that include AES/EBU and Dante. This multi-format compatibility ensures seamless integration into existing audio setups, making it a versatile choice for audio professionals.

In terms of reliability and durability, the DN9848 is built to withstand the rigors of the professional audio world. Its rugged chassis and high-quality components ensure that it can perform consistently in various conditions, making it a trusted partner for sound engineers.

In summary, the Telex DOC02-DN9848 Loudspeaker Processor combines sophisticated audio processing capabilities with user-friendly features and robust connectivity. Its advanced technology and flexible options make it an indispensable tool for achieving optimal sound in a variety of professional audio environments.
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