Meridian Audio 568 manual Digital Surround Processor, Digital Signal Processing

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The 568 Digital Surround Processor

Introduction

The 568 Digital Surround Processor incorporates the result of several years of research and development into several innovative technologies.

Digital Signal Processing

Digital Signal Processing, or DSP, is a technique pioneered by Meridian in hi-fi products for achieving extremely accurate reproduction of audio signals using high-precision mathematical processing.

DSP allows sophisticated processing to be performed without any of the cumulative noise or degradation that inevitably occurs, even with high-quality analogue circuitry. In addition, several of the surround-sound decoding techniques and signal improvement techniques available in the 568 would be virtually impossible to implement in analogue circuitry.

The 568 takes advantage of DSP for several different functions:

❍To remove timing variations from the incoming digital signals (de-jittering).

❍To expand the precision of the signal to use the full available range.

❍To resample the signal to take advantage of the highest rate available (upsampling).

❍To perform filtering or adjustment of the frequency response; eg treble or bass.

❍To decode digitally-encoded signals from Dolby Digital (AC-3), DTS, or MPEG Audio.

❍To process the audio into a multi-channel signal, and match the source channels to the configuration of main loudspeakers and subwoofers in the system.

The 568 converts analogue input signals to digital format, using high-quality analogue-to-digital converters (ADCs). Digital signals, from CD, DVD, LaserDisc or digital broadcasting, are already in digital format and do not need to be converted.

The signals are then retained in digital form throughout the 568 until they are converted back to analogue form at the analogue outputs, to drive power amplifiers. If you are using the 568 with Meridian DSP Loudspeakers, the signals remain in digital form until the last possible stage.

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Contents Meridian 568 Digital Surround Processor Meridian 568 Digital Surround Processor User Guide Sales and service in the USA Contents Setting up the digital surround processor DSP presetsConfiguring the digital Surround processor Using a computer Troubleshooting 105Glossary115 Preface Introduction 568 Digital Surround Processor Digital Signal ProcessingSeries communications Meridian High Resolution MHRMeridian Compact Theatre Sample configurationsMeridian Digital Theatre Specification Specification and accessoriesAvailable accessories Meridian 511 S-patch BoxMeridian 519 Demodulator Rack mount kit Fan kitDSP presets Multi-channel digital sourcesDolby Digital Multi-channel sources encoded onto two channels Mpeg SurroundPro Logic TV Logic Conventional stereo sourcesTHX Cinema AmbisonicSpecial DSP presets Using the digital surround processor Front panel Using the digital surround processorMeridian System Remote Quick guide to operating the 568 with the remote To switch on from standby Selecting a sourceTo select a source To switch to standby To restore the sound Adjusting the volumeTo change the volume To mute the soundTo change the DSP preset Changing the DSP presetTo change the display Changing the displayUsing the digital surround processor Defining your own presets Locking and unlocking the menus To lock the menusTo unlock the menus Changing the DSP parameters Using a Meridian DSP loudspeakerTo change a DSP parameter Standard parametersOSD Standard parametersTo change the absolute phase Changing treble, bass, or phaseTo change the bass To change the trebleTo move the listening position to the left or right Changing the listening positionAdjust their level until To change the relative delay of the centre speaker Changing the integration of the centreTo change the relative level of the centre speaker Changing the spaciousness of the sound To change the relative delay of the rear or side speakersTo adjust the lip sync Changing the lip sync and on-screen displayTo change the position of the on-screen display To change the DSP preset for a source Changing the DSP preset for a sourceTo save the preset settings Defining your own presetsSto.ser To clear a user-defined preset DSP presets Pro Logic Logic DSP presetsPro Logic and THX Cinema DSP preset parameters THX CinemaTV Logic TV Logic DSP preset parameters Mono DSP preset parametersMono Music DSP presets MusicTrifield Music and Trifield DSP preset parameters Super Stereo AmbisonicAmbisonic and Super Stereo DSP preset parameters Music Logic DSP preset parametersMusic Logic DTS Music Stereo and Direct DSP preset parametersMpeg Music Stereo and DirectMovie DSP presets Dolby DigitalDolby Digital THX, DTS THX, Using dynamic range control Movie DSP preset parametersUsing peak-level limiting Setting up the digital surround processor Radio interference UnpackingPositioning the digital surround processor Safety warningsTo avoid interference To avoid overheatingConnecting the digital surround processor Rear panelVideo connections Analogue audio inputs Digital audio inputsAudio outputs Communications connectionsOther connections On-screen display Connecting videoTo connect to Meridian DSP loudspeakers Connecting speakersUp the digital surround processor To connect an active subwoofer eg Meridian M1500 or M2500 To connect to an analogue source eg Meridian 504 FM Tuner Connecting sourcesTo connect to a LaserDisc player To connect to a DVD player eg Meridian DVD PlayerTo connect to a 562 or Multimedia Controller To connect to other Meridian 500 Series equipment Connecting to other Meridian equipmentPage Choosing a standard setting To select a Type ConfiguringDTS Mpeg Standard source settingsUsing the calibration procedure Using a Sound Pressure Level meterCalibrating the system To choose the distance units To start the calibration procedureTo move between the calibration tests To exit from the calibration procedureLevels Calibration testsDisplay shows the speaker being DistanceFine tuning Page To turn on Sine/Sub mode Setting up subwoofersTo turn off Sine/Sub mode To adjust the subwoofer crossover frequencyTo change the sweep rate To use the sinewave sweep testTo select the channel To select other test signalsConfiguring the digital surround processor using a computer Presets Meridian Configuration programSetup SourcesTo install the Meridian Configuration program Installing the Meridian Configuration programPlanning the configuration RequirementsTo run the Meridian Configuration To connect the serial cable Creating a new settings file To enter your personal details To display the settingsTo display or edit the settings To specify the speaker layout Setting up speakersMains Centre SurroundsSubwoofers Speaker protection To specify the speaker sizesTo complete the speaker setup Subwoofer filtering and typePeak-level limiting Setting up sources To set up sourcesTo configure the source options Configuring the digital surround processor using a computer To set the advanced source options Configuring the digital surround processorConfiguring presets To modify a built-in presetTo set up presets To create a user-defined preset To restore the DSP parameters to their defaultsTo delete a user-defined preset To change the setup options Changing the setup optionsConfiguring the digital surround processor using a computer To store the settings to the digital surround processor Calibrating the settings with your systemTo save the settings To print a summary of settingsTo calibrate the loudspeakers To fetch the calibrated settingsTo name the User Type Creating a User TypeClick the Copy as new user type button To create additional User TypesTo copy settings between User Types Completing the configuration To save the current settingsTo store the settings to the 568 Digital Surround Processor 104 Troubleshooting Standby point not lit General operating problemsRemote not working Erratic or unexpected system behaviourUnit is overheating Audio problems Hum on analogue inputThere is radio interference Crackling on optical inputs Audible hiss at high volume settingsThere is a hiss when starting DTS LaserDiscs Sound not clearCentre not working Poor picture quality Video problemsPreset options do not appear or are not available Meridian Configuration program problemsService and guarantee ServiceGuarantee 114 Glossary Absolute phase Controller Dolby SurroundAC-3 Aspect ratioLayout LFE subLimit Max SPLMono surrounds PresetSource Steered surroundsTHX SurroundTypeIndex 120 121 MHR Sources 124
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568 specifications

Meridian Audio is renowned for its high-fidelity audio solutions, and three of its standout products, the 861, 561, and 568, showcase the brand's commitment to excellence in sound reproduction and innovative technology.

The Meridian 861 is a flagship digital surround sound controller that offers unrivaled flexibility and control for multi-channel audio systems. Designed to work seamlessly with both music and cinematic audio, the 861 features advanced digital signal processing (DSP) that enables users to customize their listening experience. This model supports various connectivity options, including HDMI and digital audio inputs, ensuring compatibility with a wide range of sources. One of the key characteristics of the 861 is its ability to deliver high-resolution audio formats, making it a superior choice for audiophiles seeking pristine sound quality.

Moving on to the Meridian 561, this versatile preamplifier is designed for those who appreciate the nuances of carefully crafted audio. With its robust construction and superior circuitry, the 561 emphasizes low distortion and high clarity in audio playback. This model offers a range of inputs, including both analog and digital, allowing integration with various audio components. The 561 features Meridian's proprietary technologies that enhance the listener’s experience, such as Room Correction technology that compensates for acoustic anomalies in the listening environment, delivering optimal sound quality in any space.

The Meridian 568 processor holds its ground as a unique digital surround sound processor used in sophisticated home cinema systems. Known for its precision and clarity, the 568 is fully equipped to handle the complexities of modern audio formats, including Dolby Digital and DTS. With multiple output channels, it provides spacious sound staging, and its intelligent processing capabilities ensure that every frequency is rendered accurately. This model is particularly popular among home theater enthusiasts who demand a cinematic experience with uncompromised audio fidelity.

In summary, the Meridian 861, 561, and 568 not only represent technological prowess but also reflect Meridian Audio's dedication to providing exceptional sound experiences. Each model is engineered with unique features designed to meet diverse audio needs, ensuring that music and cinematic presentations are delivered with breathtaking realism and clarity. With these products, Meridian continues to lead the way in high-performance audio technology, setting benchmarks for quality and innovation in the industry.
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