Meridian Audio 565 manual Audible hiss at high volume settings, Crackling on optical inputs

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Troubleshooting

56

Audible hiss at high volume settings

The input dynamic range of any recordings you have are 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-reel tape, 13 bits.

❍Cassette tape, 12 bits.

❍LP, 11 bits.

Note that 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 565 has a 16-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.

The 565 has 18-bit output precision on the analogue outputs.

Other sources of hiss may be tracked down using either:

❍The Mute option. When muted the outputs are reduced to the dither at the selected precision.

❍The Silence test signal; see Test signals, page 44.

Crackling on optical inputs

Some optical sources, in particular some LaserDisc players, provide poor drive waveforms that do not meet the EIAJ standard, in that the light modulates but never goes quite ‘black’ between pulses. If you experience crackling on the optical input or an occasional reluctance to lock, ie provide a sound, investigate as follows.

❍Try other fibres.

❍Pull the fibre part-way out and see if the problem clears up.

❍Try another player or CD player on the optical input.

❍Contact Meridian for up-to-date advice on this point.

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Contents Meridian 565 Digital Surround Processor Preface Manufactured in the UK byContents Setting up sources TroubleshootingCalibrating the system Introduction IntroductionPlanning a system Three-channel surround system Layout G or L, No SurroundsIntroduction Introduction Using the 565 with Meridian DSP Loudspeakers Surround system with full-range speakers Layout LUsing an analogue preamplifier Using a Digital Control UnitUsing a LaserDisc player Planning sourcesSetting up the digital surround processor Setting up the digital surround processor UnpackingTo position the digital surround processor Radio interferenceConnecting the digital surround processor SettingRear panel Video connectionsAudio inputs Audio outputsCommunications connections RS232 connectionConnecting video Setting up the digital surroundOn-screen display Connecting speakers To connect to Meridian DSP Loudspeakers eg DSP5000To connect to Meridian Active Loudspeakers Subwoofer Connecting sources To use the digital surround processor as a preamplifierTo connect to a 519 Demodulator To connect to a 562 or 562V Digital Control Unit Surr Analogue Tape OUT A4 in Audio Inputs Digital Optical Connecting to other Meridian equipment To connect to other Meridian 500 Series equipmentConfiguring the digital surround processor Choosing standard settings To select a standard settingProcessor Standard settings How to use the table of speaker layouts Configuring the digital surround processorSpecifying the speaker layout Small main speakers Speaker layouts To set the speaker layout To define the shape of the speaker layoutDigital surround Configuring the digital surround processor To set other configuration options To select a 5.1 LFE subwooferSetting up the speaker outputs To time-align the systemTo set up a speaker output To change the settings for a speakerTo select the output type DigitalTo set the output delay To set up speaker protection for 5.1 sources To specify the output precisionDigital surround processor To specify the type of subwoofer Calibrating the system Calibrating the systemUsing the calibration procedure Using a Sound Pressure Level meterTo start the calibration procedure To exit from the calibration procedureTo move between the calibration tests Calibration tests LevelsMain Centre Phase Front-Rear Surround Sides Subwoofers Other subwoofers LRSADC Check What next?System Test signals To select a different test signalTo test for room vibrations Setting up sources Setting up sourcesStandard source settings DTS THX Mpeg THXTo configure a source To change an optionOption Initial value Alternative values Explanation MPEG, Mpeg THX Examples of configuring the sources To use a source key to change DSP presetTo change a source label To set up a system with two Meridian CD players Setting up sources Troubleshooting TroubleshootingGeneral operating problems Standby point not litRemote not working Communications not working with other Meridian productsAudio problems Hum on analogue inputPoor sound quality There is radio interferenceAudible hiss at high volume settings Crackling on optical inputsThere is a hiss when starting DTS LaserDiscs Sound not clearCentre not working Video problems TV does not work using Poor picture qualityIndex IndexLayouts Optical Types
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565 specifications

The Meridian Audio 565 is a landmark in the realm of high-fidelity audio processing. Launched as a digital surround sound processor, it has captivated audiophiles and home theater enthusiasts with its innovative technology and exceptional sound quality. The 565 serves as a definitive solution for those looking to enhance their audio experience, boasting a range of features that solidify its status in the industry.

One of the main features of the 565 is its advanced digital signal processing capabilities. It utilizes Meridian’s proprietary Apodizing filter technology, which significantly improves frequency response and effectively reduces time-domain distortion. This technology enables precise sound reproduction, allowing listeners to experience their favorite music and movies as intended by the creators.

The Meridian 565 is equipped with multiple inputs and outputs, supporting various audio formats. It features both balanced and unbalanced audio connections, ensuring compatibility with a wide range of audio equipment. This flexibility allows users to seamlessly integrate the 565 into their existing audio systems, whether they are aiming for stereo or surround sound configurations. The device supports multi-channel audio formats, giving users the opportunity to experience immersive soundscapes.

Another noteworthy characteristic of the 565 is its user-friendly interface. It comes with a well-organized remote control and an intuitive on-screen display that simplify the process of configuring and operating the device. Users can easily adjust settings, switch between different input sources, or fine-tune audio parameters to suit their personal preferences.

The build quality of the Meridian 565 is also commendable. Typically housed in a robust chassis, the device is designed to minimize interference from external electromagnetic sources, thus preserving audio integrity. This attention to detail in construction reiterates Meridian’s commitment to delivering high-performance audio solutions.

In conclusion, the Meridian Audio 565 is an exceptional digital surround sound processor that combines advanced technology with user-friendly features. Its unique technologies, such as Apodizing filtering, flexible connectivity options, and robust build quality, make it a top choice for audiophiles and home theater enthusiasts alike. Whether for casual listening or an immersive cinematic experience, the 565 stands as a testament to Meridian's dedication to excellence in audio engineering.
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