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MERIDIAN 518 USER MANUAL
© 1992, 1993, 1995
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2 Contents Putting the 518 in Standby ................ 18 Sales and service in the UK ...................4 Coming out of Standby...................... 18 Sales and service in the USA.................4 Muting the sound............................... 19 Designed & manufactured in the Menu Keys........................................ 19 UK by..................................................4 Operating 518 as Resolution Enhancer (Type 1)........................... 19 Acknowledgements...............
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3 Simple rules for using 518 ..................40 Appendix 2 – Hints on Mastering with noise-shaping ......................... 47 Additional technical information.........42 Appendix 3 – RS232............................. 49 Specification.........................................42 Appendix 4 –Resolution Help!......................................................43 Enhancement .................................. 50 Standby point not lit ...........................43 Jitter and de-jittering.......
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4 Sales and service in the UK Meridian Audio Ltd Stonehill Huntingdon Cambs. PE18 6ED England Tel (0) 480 52144 Fax (0) 480 459934 Sales and service in the USA Meridian America Inc. 3800 Camp Creek Parkway Building 2400, Suite 112 Atlanta, GA 30331 Tel. (404) 344-7111 Fax (404) 346-7111 Designed & manufactured in the UK by Digital Gramophone & Wireless Ltd Stonehill Huntingdon Cambs. PE18 6ED England Copyright © 1992,1993,1995 Digital Gramophone & Wireless Ltd Acknowledgements Trademarks etc. Bo
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Installation 5 Introduction The Meridian 518 Digital Audio Processor is part of the 500 Series of advanced high-fidelity equipment. In purchasing a Meridian 518 Digital Audio Processor, you have acquired a refined piece of equipment that will continue to bring you listening pleasure for many years. This manual will enable you to get the most from it. About this manual Because the 518 is such a flexible item, we have divided this manual into three parts. Part 1 gives an overview of 518 and gives
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Installation 6 Part 1 Unpacking the 518 On opening the carton, you should have found the following parts: • Meridian 518 Digital Audio Processor • Power cord • This manual • 500 Series communications lead If any of these items is missing, please contact your dealer. We suggest that you retain the packing carefully as it provides maximum protection for the unit in transit. Installing your 518 General precautions Before carrying out any installation, you should ensure that the 518 is marked with t
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Overview of 518 7 Planning setup of 518 Firstly, the 518 is a product for enthusiasts! We designed it for audio and multimedia enthusiasts, keen listeners and those with enthusiasm for the best sound. However, 518 is something of a chameleon. What do we mean by that? This is best explained by seeing what it does: 518 fulfils four very different functions in one box. We have categorised uses (applications) of 518 into four broad headings, as follows: • A simple 'preamp' or Control Unit for a puri
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Overview of 518 8 Overview as Preamp (Type 0) Conventional analogue systems use a 'preamp' or control unit to gather together the various sources and to control the level of signal fed to the power amplifier so you can adjust volume. Purists know that no matter how well a piece of analogue audio electronics is designed, there will always be unwanted and irreversible degradation, due to the addition of noise and distortion. Preamps are by no means immune from this. For this reason, Meridian have
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Overview of 518 9 What about analogue sources? Tuner LP 562 518 CD Player LaserDisc DAT Using 518 with a 562 Analogue sources need to be converted to digital before passing through 518. Meridian make the 562 and 562V digital controllers, both of which have very high quality delta-sigma analogue–digital converters. By adding a 562 to the system you will be able to feed 7 analogue sources (like radio, tape, even LP) in addition to 5 digital sources. A 562 also provides full tape copy and 2-room fa
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Overview of 518 10 Overview as Resolution Enhancement Processor (Type 1) There are a wide number of applications for this mode of 518: three examples are described. CD or LaserDisc playback improvement Many installations use the 2-box CD player format of CD transport + DAC. The CD transport provides a digital output, and of course may be a normal CD player where the digital output is used to drive an outboard DAC to improve the quality. This CD playback system may then have its analogue output c
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Overview of 518 11 DSP Tuner Speaker LP 562 518 CD Player LaserDisc DSP Speaker DAT Using 518 with DSP Loudspeakers As the diagram shows, a 518 can be placed between the 562 and the Meridian DSP speakers. In this case, the 518 is used – very much as it is for the earlier CD example – to provide further de-jittering and resolution enhancement. The Meridian DSP speakers can read 22 bits on the input and have analogue de-emphasis, so 518 can significantly improve the 4 sound of this system. Because
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Overview of 518 12 Overview as Mastering Processor (Type 2) Recorder Mixer ADC 518 Recorder DAT Using 518 as a Mastering Processor The 518 is closely related to the highly respected Meridian 618 Mastering Processor; in fact 518 uses identical DSP to the 618 in this mode. The Meridian 618 has been used for over three years by some of the world's most experienced recording engineers and there is a long and growing list of superior CDs that have used 618 in their production. See page 4. A mastering
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Overview of 518 13 • De-jittering. This is vital to getting good sound when recording or playing back from a computer-based sound storage system. • Matching wordlengths input to output. Hard disc storage systems tend to use 16 or 24 bits. While 16 bit storage is quite adequate for simple transfer, it does not allow any headroom for manipulation of the signals – without degrading noise. 518 can be used to ensure that all the headroom in the disc storage is used by boosting the incoming signals to
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Using 518 in Hi Fi Systems 14 Starting off with 518 Checking Before turning on the power, check once again that you have made all the connections correctly. The 518 is designed to be left connected to AC power at all times and can be run continuously. Switching on The power switch is located directly next to the power inlet on the right- rear of 518. 1. Turn on the power switch at the rear of the unit. A small point on the display should now be illuminated. . If there is no display Check the int
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Using 518 in Hi Fi Systems 15 Note 518 can be used with or without other Meridian equipment. When it is used as the main system control unit it is normally the ‘System Controller’ and operates exactly as described below. Systems including other Meridian control units like 562 or 565 or DSP speakers will always elect for 518 not to be System Controller and there are some functional differences. Operating 518 as a Control Unit (Type 0) Note Do not use 518 as a Control Unit if the system has a Mer
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Using 518 in Hi Fi Systems 16 The numbers indicate the number of output bits. C and P represent the choice of consumer and professional channel status formats respectively. Information: 24 audio data bits are always written to the left and right output words but the least significant bits, below the number of output bits chosen, are set to zero. e.g. for 16 C 16 data bits 0 0 0 0 0 0 0 0 e.g. for 18 C 18 data bits 0 0 0 0 0 0 0 0 In 1. Press In to cycle between the input word options. The In key
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Using 518 in Hi Fi Systems 17 Shape C uses flat dither and a 9th-order shaper optimised to MAF. Shape D Shape D uses high-pass dither and a 9th-order shaper optimised to MAF. Shape E Shape E uses high-pass dither and a 2nd-order shaper optimised to MAF. DSP 1. Press DSP to select the primary processing mode. The display will show: Gain 87 Gain has a flat frequency response, but the level of the signal level is adjusted using a precision dithered multiplication. All the front panel keys are avail
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Using 518 in Hi Fi Systems 18 20C16 67 Input/output choice and gain setting, (This example indicates 20 bits of input and 16 bits of output in consumer format), or 44k1 67 Sampling frequency and gain. If there is no input signal the display would indicate no lock as follows: N.L. 67 Emphasis Light There is a light on the front panel Emph which indicates when the channel status suggests that the incoming audio is pre-emphasised. It is not affected by the user's settings on the 518 itself. Clip Di
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Using 518 in Hi Fi Systems 19 Muting the sound The mute facility cuts off the sound by setting the volume level to zero. To mute the sound 1. Press Mute on the Remote Control. The output will mute and the display will change to: Muted To restore the sound 1. Press Mute a second time. The volume level and display will be restored. Menu Keys When the 518 is used as a control unit and it is the system controller, then the four menu keys on the MSR can be used to access the DSP, Dither, In and Out m
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Operation summary 20 Memory In Resolution Enhancement mode, 518 maintains a continuous memory of the DSP, Dither, Gain, In and Out settings for each source. So, if you had determined that, e.g. CD should always use Gain 0dB but that Radio could always use Emphasis and +2dB, then 518 will remember these and automatically reconfigure itself for each source. DSP In addition to the DSP modes offered in Control Unit (see page 15), Resolution Enhancement adds Bypass. Bypass transmits all 24 bits on th
