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Meridian 565 User Manual

Digital surround processor
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Meridian 565 Digital Surround Processor

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  • Page 1 Meridian 565 Digital Surround Processor...
  • Page 2 5,043,970; 5,189,703; 5,222,059), Trifield Productions Ltd, and Nimbus Boothroyd|Stuart Meridian, Meridian, Meridian Digital Theatre, MLP, and Records Ltd. LipSync are registered trademarks of Meridian Audio Ltd. Dolby, Pro Logic, AC-3, and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. Lucasfilm, THX, and THX This guide was produced by Human-Computer Interface Ltd, Cambridge, Cinema are registered trademarks of Lucasfilm Ltd.

  • Page 3: Table Of Contents

    Contents Introduction Introduces the digital surround processor Using the digital and describes the alternative surround surround processor sound configurations that it supports. The Meridian 500 Series ......2 Provides step-by-step instructions for Customising the digital Sample configurations ......3 operating the digital surround processor, surround processor Specification and accessories ....
  • Page 4 DSP presets Gives technical information about each of the DSP presets, with details of the special Service and guarantee 45 parameters available for each one. Logic DSP presets ......... 34 Gives information about servicing your Music DSP presets ........ 37 digital surround processor.

  • Page 5: Introduction

    Introduction he Meridian 565 Digital Surround Processor is unique in being the first completely digital surround-sound processor, and it defines the standard for both music and cinema performance. To achieve this we have combined the latest techniques in high-precision analogue electronics and digital signal processing with a careful analysis of all types of recorded music.

  • Page 6: The Meridian 500 Series

    The Meridian 500 Series 500 Series communications The 565 Digital Surround Processor is part of the Meridian 500 Series of advanced digital, analogue, and video components designed to meet the demand for absolute quality, ease of use, The Meridian 500 Series includes a sophisticated and lasting value.

  • Page 7: Sample Configurations

    Sample configurations Three-channel stereo system Five-channel surround system M6 0 M60C M60C The first step you can take in exploring the benefits of surround The next step in creating a surround system for cinema and sound is to add a centre speaker to the left and right speakers of music reproduction is to add a pair of rear channel surround a conventional stereo system.
  • Page 8 THX system Meridian Analogue Theatre M60C M2500 M60C A THX system is designed to recreate the original cinema sound The ultimate analogue surround system consists of two pairs of in your home. It uses a mono subwoofer to enhance the bass Meridian M60 Active Loudspeakers, in conjunction with a from the main left and right speakers.
  • Page 9 Meridian Digital Theatre™ Meridian Digital Theatre using DSP6000 Digital Loudspeakers DSP6000C DSP6000 DSP6000 DSP6000 DSP6000 DSP5000 DSP5000 DSP5000 DSP5000 DSP5000C M2500 The Meridian Digital Theatre is a completely digital system which The ultimate Meridian Digital Theatre uses a 565 in conjunction provides audiophile-quality surround sound for music and film.
  • Page 10 A complete multimedia surround An AC-3 LaserDisc system system DSP5000 DSP5000 LaserDisc DSP5000C Optical Optical Video recorder The digital surround processor can be upgraded to provide fully LaserDisc digital decoding of 5.1 channel AC-3 sources, to give the highest-possible sound quality available, combined with comprehensive support for the flexible AC-3 decoding options and user features.

  • Page 11: Specification And Accessories

    (12.7" x 3.5" x 13.1") (W x H x D). signal processors running at 60MHz. Weight 5kg (10lb). 7.1 version: Z3 card based on an additional Motorola DSP running at Meridian Audio reserves the right to amend product 88MHz. specifications at any time.

  • Page 12: Available Accessories

    If you have problems ordering these items you can order them To take advantage of Dolby Digital on LaserDisc you also need direct from Meridian Audio Limited, who can also supply a range the Meridian 519 Demodulator, which converts the LaserDisc of cables suitable for connecting the digital surround processor RF output to a bitstream which can be fed to the 565.

  • Page 13: Dsp Presets

    DSP presets Multi-channel digital sources The digital surround processor provides an extremely comprehensive range of options for decoding both analogue and digital audio signals and processing them for multi-channel The 565 Digital Surround Processor supports the three reproduction. alternative multi-channel digital formats currently available, which encode up to 8 different channels onto a digital signal: The digital surround processor provides several digital signal Dolby Digital (AC-3), DTS, and MPEG Audio.
  • Page 14 Multi-channel sources encoded onto MPEG Surround two channels MPEG Surround is the preferred audio format for DVD in PAL territories, and along with Dolby Digital is a contender as the Several systems have been developed for encoding multi- standard for music and performance videos on DVD worldwide. channel sources onto a standard two-channel analogue signal In addition, it is widely available in US satellite broadcasts.
  • Page 15 Conventional stereo sources TV Logic TV Logic provides user-adjustable steering, and is The digital surround processor can also accept a conventional recommended for use with TV broadcasts that are not surround two-channel source, such as music on compact disc or a video encoded, where Pro Logic may give reduced intelligibility.
  • Page 16 Special DSP presets Trifield Trifield uses a different processing technique to give a stable, The digital surround processor also includes the following three-dimensional image, with the ability to adjust the width of special DSP presets, for specific applications: the image. Because of its precision we recommend this option for solo, chamber, or vocal music.

  • Page 17: Using The Digital Surround Processor

    Using the digital surround processor his chapter provides a summary of the functions of the digital surround processor to identify the controls which you use to operate the unit. It also provides step-by-step instructions for operating the digital surround processor, using either the front panel or the Meridian System Remote.

  • Page 18: Front Panel

    Front panel 1 Source Selects the source. 2 Store Changes the DSP preset Display selected for a source. 3 Display Changes the information displayed on the front panel. BOOTHROYD STUART Digital 4 < (menu left) < > Source Store Display Digital Surround Processor Selects the previous DSP parameter.

  • Page 19: Switching On And Off

    Switching on and off To switch to standby When not playing, the digital surround processor should be left in the standby state. This uses a negligible amount of electricity, but ensures that the components of the digital surround Press Off on the front panel or the remote. processor operate at maximum efficiency from the moment you start.

  • Page 20: Selecting A Source

    Selecting a source To select a source Press Source (front panel) until the display shows the source you require, or press the appropriate source key on the remote; eg CD. The display shows the source and volume setting. For example, if you select the CD source the display will show: Then after a short delay the display shows the currently selected DSP preset:...

  • Page 21: Adjusting The Volume

    Adjusting the volume To mute the sound The digital surround processor adjusts the volume in precise steps of 1dB, where 9dB is equivalent to doubling the loudness. The current volume setting is displayed in dB on the front panel Press Mute (remote). display, and can be varied in the range 1 to 99dB.

  • Page 22: Changing The Dsp Preset

    Changing the DSP preset Each source has a set of DSP presets associated with it, one for You will be able to choose any of the predefined DSP presets, or each of the alternative audio formats: two-channel (PCM), Dolby any user-defined presets you have stored. Digital, DTS, MPEG, and MLP.

  • Page 23: Changing The Display

    Changing the display The digital surround processor displays information about the Display option Example current settings on the twelve-character front panel display. In Music addition, it can display the same information superimposed on a DSP preset and volume video image. For more information about setting up the on- screen display refer to the Meridian 565 Digital Surround M u s i c - 2 2...

  • Page 25: Customising The Digital Surround Processor

    Customising the digital surround processor n addition to being able to change the source, volume, and DSP preset, the digital surround processor provides a sophisticated range of more advanced adjustments for each DSP preset, to allow you to tailor the sound.

  • Page 26: Locking And Unlocking The Menus

    Locking and unlocking the menus To simplify the normal operation of the digital surround processor, and to protect the settings from accidental changes, you can lock the menus so that the parameters cannot be accessed. To display or change the DSP presets, or to define your own presets, you first need to unlock the digital surround processor menus.

  • Page 27: Changing The Dsp Parameters

    Changing the DSP parameters To change a DSP parameter Each DSP preset provides a series of parameters that you can vary to customise the behaviour of the preset to your specific requirements. For example, most presets provide Balance and Make sure the menus are unlocked; see To unlock the menus, Depth parameters which alter the characteristics of the sound.

  • Page 28: Standard Parameters

    Standard parameters Parameter Range Default What it changes Treble * † -10dB to +10dB +0dB The slope of the frequency response. Bass * † -5dB to +5dB +0dB The bass response. Phase * + or - The phase of all loudspeakers. Balance <10 to 10>...

  • Page 29: Changing Treble, Bass, Or Phase

    Changing treble, bass, or phase Press A or V to change the treble. The digital surround processor provides sophisticated treble and bass controls, to allow you to adjust the broad balance of the system to correct for the acoustics of your listening room, or for The treble control tilts the frequency of the response over the a misbalanced recording.

  • Page 30: Changing The Listening Position

    Changing the listening position A conventional stereo system provides a single balance control, Note that this adjustment is not available for the Mono or which changes the relative loudness of the two speakers. The Academy presets. 565 Digital Surround Processor provides a more sophisticated To change the relative level of the rear adjustment which corresponds to moving the listening position or side loudspeakers...

  • Page 31: Changing The Integration Of The Centre

    Changing the integration of the centre To change the relative delay of the If you have a centre loudspeaker you can adjust its relative centre speaker loudness, to provide the best integration of the centre with the main left and right speakers. Press >...

  • Page 32: Changing The Spaciousness Of The Sound

    Changing the spaciousness of the sound You can adjust the spaciousness of the sound by altering the The Dolby Digital, Music, Trifield, and Ambisonic presets delay on the rear and side channels. allow you to vary these delays down to 0ms. Note that these adjustments are not available for the Direct, Stereo, Mono, or Academy presets.

  • Page 33: Changing The Lip Sync And On-Screen Display

    Changing the lip sync and on-screen display To adjust the lip sync To change the position of the on-screen display The LipSync parameter is a unique feature of the digital surround processor which allows you to adjust the delay For each DSP preset you can specify the position of the between the sound and the video image by up to one video on-screen display (OSD), or blank the on-screen display frame.

  • Page 34: Changing The Dsp Preset For A Source

    Changing the DSP preset for a source Press A or V until the display shows the new DSP preset you Each source has an appropriate DSP preset associated with it for each music format. For example, for a standard stereo (PCM) want to store.

  • Page 35: Defining Your Own Presets

    Defining your own presets The 565 Digital Surround Processor allows you to design up to F o o t b a l l 16 DSP presets of your own and save them permanently, with For example: names of your choice, so you can use them alongside the built-in DSP presets.
  • Page 36 If you have an on-screen display it shows: When you have entered the name you want to use press Store. S t o r e d The display shows: To clear a user-defined preset Make sure the menus are unlocked; see To unlock the menus, page 22.

  • Page 37: Dsp Presets

    DSP presets his chapter gives technical information about each of the DSP presets built in to the digital surround processor. It explains the processing performed by each DSP preset, and gives details of the types of material you should use with each preset. It also gives details of the special DSP parameters available for each preset.

  • Page 38: Logic Dsp Presets

    Logic DSP presets Pro Logic The digital surround processor provides five DSP presets specifically designed for reproducing stereo film soundtracks. Three of these presets, Pro Logic, THX Cinema, and TV Logic, Dolby Surround is an encoding system based on a phase- are designed for Dolby Surround encoded material.
  • Page 39 THX Cinema THX can also be used with the 5.1 Movie DSP presets; see Dolby Digital THX, DTS THX, and MPEG THX, page 42. The THX Cinema DSP preset provides Pro Logic decoding, Pro Logic and THX Cinema DSP followed by additional signal processing refinements developed preset parameters by Lucasfilm Ltd.
  • Page 40 TV Logic DSP preset parameters If there is a centre speaker, the combined or selected signal is played only through this to centrally localise high-frequency hiss Parameter Options What it changes and clicks. Roll Off, Low, Med, High The degree of left- The Academy DSP preset includes an equalisation right steering.

  • Page 41: Music Dsp Presets

    Music DSP presets Music The digital surround processor provides seven alternative music DSP presets designed for the reproduction of well recorded material, originally intended for replay over a traditional stereo The Music DSP preset extracts the mono and surround pair of loudspeakers. components of the original recording.
  • Page 42 Music and Trifield DSP preset This gives a significant improvement over traditional stereo, parameters which converts the differences between the microphone signals into amplitude differences in the speaker signals. This version of the Trifield algorithm is virtually impossible to implement without Parameter Options What it changes...
  • Page 43 Ambisonic recording space whether you are at the exact central seat or well off to one side. The Ambisonic DSP preset is designed for replaying material encoded in UHJ format, the two-channel stereo-compatible Of all the signal-processing options, Ambisonic is the one that encoding found on Ambisonically-recorded discs and requires the greatest attention to speaker choice and positioning.
  • Page 44 Ambisonic and Super Stereo DSP Music Logic preset parameters Music Logic is a music DSP preset with user-adjustable Parameter Options What it changes steering, designed to provide an exciting experience with many types of studio-produced music. Width * 0 to 1 The width of the image.
  • Page 45 MPEG Music MPEG Music is a special version of the MPEG preset designed for listening to MPEG encoded music CDs. Stereo and Direct The Stereo preset passes the left and right input signals directly to the left and right main speakers. Any mono or front left and right subwoofers continue to be used.

  • Page 46: 5.1 Movie Dsp Presets

    5.1 Movie DSP presets MPEG The discrete digital formats can encode up to eight separate channels, which can be decoded to provide separate signals to the eight speakers in a surround configuration. MPEG surround is the preferred audio format for DVD in PAL territories.
  • Page 47 5.1 Movie DSP preset parameters Using dynamic range control Parameter Options What it changes Because Dolby Digital is a digital format it allows dynamic range control without the distortion involved in analogue methods. The Surr. Rear Surr. Rear, Surr. Side, Switches the surround Compress parameter can be set to one of the following options: Surr.
  • Page 48 Using peak-level limiting The Max SPL or Limit parameters allow you to set up peak-level limiting for bass signals, and the setting applies to all the discrete digital DSP presets. If your loudspeaker layout includes one or more subwoofers the parameter is named Max SPL, and it sets the peak-level limit for the LFE channel.

  • Page 49: Service And Guarantee

    Service and guarantee...
  • Page 50 Meridian Audio Limited. Note that connecting anything other than the correct network lead to the COMMS In case of difficulty within the UK or USA please contact the sockets may cause damage to the 565 Digital Surround appropriate sales and service address shown on page ii.

  • Page 51: Glossary

    Glossary Absolute phase Controller A control which changes the phase of the The product in a Meridian system that Digital Theatre Systems originally signals to all the speakers. uses the infra-red signals from the remote produced digital audio tracks for motion to control the system.
  • Page 52 Layout Limit Mono sub Refers to a particular arrangement of A DSP parameter that sets the peak-level A subwoofer which handles all the bass for speakers and subwoofers. You can select limit of the bass signal added to the main the system.
  • Page 53 Source Surround On-Screen Display, which the 565 can An input to the system, such as CD or TV. A sound reproducing system with more superimpose on a composite video signal The Meridian 500 and 800 Series provide than two loudspeakers, and usually with to give information about the state of the 12 named sources, corresponding to the speakers behind or to the side of the...
  • Page 54 Type A standard configuration of the digital surround processor. Selecting a Type resets any configuration and calibration changes.

  • Page 55: Index

    Index AC-3 encoding 9 Defining your own presets 31 DSP parameters (continued) AC-3 LaserDisc system 6 Depth (DSP parameter) 24, 27 Limit 43, 44 Academy DSP preset 12, 36 Digital DSP preset 9, 42 LipSync 24, 29 Accessories 8 dynamic range control 43 Max SPL 43, 44 Ambisonic DSP preset 11, 39 Direct DSP preset 12, 41...
  • Page 56 DSP presets (continued) DTS THX DSP preset 10, 43 Max SPL (DPS parameter) 43, 44 defining 31 Dynamic range control 43 Menus, locking and unlocking 22 Direct 12, 41 Meridian 500 Series 2 5.1 Movie DSP presets 42 Dolby Digital 9, 42 500 Compact Disc Transport 4 Five-channel surround system 3 Dolby Digital THX 10, 42...
  • Page 57 Meridian Lossless Packing 10, 41 R Delay (DSP parameter) 24, 28 Sources 16 MLP DSP preset 10, 41 R Filter (DSP parameter) 38, 40 changing DSP preset associated Mono DSP preset 12, 36 Rear (DSP parameter) 24 with 30 Mono Rear (DSP Rear loudspeakers selecting 16 parameter) 35, 36, 40...
  • Page 58 UHJ format 39 Volume Unlocking the menus 22 adjusting 17 User-defined presets 31 muting 17 editing the name 31 Width (DSP parameter) 38, 40 Using the digital surround processor 13 Yaw (DSP parameter) 36, 40...

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