Meridian Audio G61 Audible hiss at high volume settings, Sound not clear, Centre not working

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Audible hiss at high volume settings

The input dynamic range of most current recordings is at maximum 16 bit. The reason for this is that currently CD, DVD, and LaserDisc use a 16-bit standard, although DVD can support up to 24-bits. The analogue sources you have cannot achieve this kind of range. For comparison, analogue sources are likely to be of the order of:

•VCR, 12 bits.

•FM radio, 13 bits.

•Reel to reel tape, 13 bits.

•Cassette tape, 12 bits.

•LP, 11 bits.

Note: There may be a difference between the dynamic range of the source channel when it is operating, and the noise you hear in standby. For example, LP normally has lower noise when the stylus is not in the groove; similarly tape will be quieter when it is stopped. CD may also be quieter when it is stopped, producing so called ‘digital silence’.

The G61 has a 24-bit capability on its internal analogue-to-digital converter, which is used for analogue sources. When the volume is turned up high you may hear its dither as a hiss when the sources are stopped. This hiss is lower than the background noise of your recordings and should be of no consequence.

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Tr o u b l e s h o o t i n g

Sound not clear

•If speech sounds muffled in a system with a centre speaker, check that sound is coming from the centre as there may be a connection problem. In a digital or Meridian feed to the centre you may have set it up to be right instead of left so that it is playing a subwoofer signal.

•If speech sounds muffled in a system with no centre speaker, you may have selected a layout that expects one. See Configuring speakers, page 18.

Centre not working

There may be a connection problem.

•In a digital or Meridian feed to the centre, you may have set it up to be right instead of left, and therefore it may be playing a subwoofer signal.

There is a hiss when starting DTS LaserDiscs or CDs

The DTS audio stream is indistinguishable from a PCM audio stream; the G61 takes 30ms to identify the encoding, during which a hiss is heard.

•With non-video DTS sources you can add a 30ms delay to avoid this.

•With video sources you can create a DTS-only source to avoid any hiss.

For more information about each of these options see the Meridian

Configuration Program Guide.

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Contents R I D I a N G S E R I E S G61 Digital Surround Controller Installation Guide Safety warnings Refer all servicing to approved service personnelTo avoid overheating To avoid interferenceContents Sales and service in the UK Sales and service in the USACopyright and acknowledgements Tel +1 404 344 Fax +1 404 346 Part no G61/1Smart Source feature IntroductionInputs Formats supportedT r o d u c t i o n Specifications T r o d u c t i o n Installing the digital surround controller UnpackingAudio inputs Use this connectorTo connect to this To connect to a digital source eg G07 24-bit CD Player To connect to an analogue source eg TV tuner#$ $6$ ! Player Audio outputs Use this output$30 n -!.!2 To connect the G61 to Meridian DSP loudspeakersM33 Phono Lead3UBWOOFER $IGITALI3URROUND #ONTROLLER To connect an active subwoofer eg Meridian M1500 or M2500Communications connections Use this connector To connect to thisScreen Auto Configuring the digital surround controller Configuration WizardTo run the Configuration Wizard To do thisReset settings Reset all settings?To reset the configuration TypeTypes Type Speakers Music Sub Logic SubTo configure the speakers Select speakersOne To change an optionSpeaker options Option Values DescriptionConfigure sources To configure a sourcePress Source When you have finished configuring sources Radio UseSource options Option ValuesStage 4 Configuring other settings Other settingsTo configure other settings To change a settingSettings Page Calibrating the system Using a Sound Pressure Level meterIntroduction To start the calibration procedure To exit from the calibration procedureTo complete the calibration procedure Left Level +0.0dBLevels Calibration testsDistance Fine tuning Left PhaseSetting What it sounds like Left DistanceSizes set to zero Speaker sizeLeft Size Using the Sine/Sub/Sens controls Sinewave sweep testSubwoofer crossover frequency CD Xover 85HzCD Sine 80.0Hz 88.5Hz81.5Hz Pause 80.0HzSetting up sources To adjust the sensitivity of a source4V Peak TV 2.0V ClipDSP presets DSP presetsSpeaker layouts Layout DescriptionStandard parameters Parameter Range Default What it changesStandard-rate audio, downsampled if necessary Music and Trifield DSP preset parameters MusicTrifield Parameter Options What it changesAmbisonics Ambisonics and Super DSP preset parametersSuper MusicLogic PLIIx MusicPLIIx Movie and PLIIx THX DSP preset parameters Stereo and DirectPLIIx Movie and PLIIx THX Surrounds Rear, Side, AllMono DSP preset parameters TV LogicMono Parameter OptionsCinema Discrete and Cinema DSP preset parametersDiscrete THX 28dB to 0dBUsing dynamic range control To save the preset settings Defining your own presetsFor example Stored To clear a user-defined presetFor example, you could change the name to Troubleshooting General operating problemsStandby light not lit Erratic or unexpected system behaviourAudio problems Remote not workingUnit is overheating Hum on analogue inputAudible hiss at high volume settings There is a hiss when starting DTS LaserDiscs or CDsSound not clear Centre not workingPreset changes unexpectedly with a multichannel Source Maintenance CleaningTo clean the case, display panel, and keypad To clean the audio and video connectionsService Service and guaranteeGuarantee Academy DSP parameter 39 accessories Calibration procedure 25 moving between tests 26 startingDSP parameters DSP presets Guarantee +2+2PLIIx Music Panorama Rear THXSubwoofer crossover frequency 30 Super DSP preset +2+2 DSP parameters THX DSP preset 40 UHJ format THX Music DSP presetTypes 16
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