Product Information Meridian 561 January 1999
561 Digital Surround Controller
From the industry
leaders in music
surround – Meridian’s
latest controller – 561 –
decodes all the sound
formats on DVD-Video
Background Meridian 561
Meridian is a world leader in superb- Meridian is proud to add the 561 Digital
sounding Digital Signal Processing. Surround Controller to its range of
Our pedigree goes back to the earliest Home Theatre and Surround Music
days of digital and includes many ‘firsts’ products.
like the first CD Transport, the first A 561 combines controller functions
Digital loudspeaker and the first DSP into a surround processor – bringing
loudspeaker. In addition, Meridian’s many of the features of a 565 + 562V
ability to provide truly transparent DSP combination to one box.
1 has made the 618 Mastering Processor
the most respected way to make CDs.
561 provides extensive audio and
video inputs and outputs – including an
Since its introduction in July 1994, analogue tape loop and support for the
the Meridian 565 DSP Surround Meridian 2-Room system.
Processor has become widely The 561 is a full 500 Series controller,
recognized as the benchmark ideally suited for use with our DSP
processor – voted Class ‘A’ by loudspeakers, CD players, power amps
Stereophile. Among a total of 12 and 504 tuner.
awards, the 565 was voted ‘Home The 561 allows you to take control of
Theatre Decoder of the Year’ by Home your system: you can switch audio,
Entertainment in both 1995 and 1996, video, adjust input level; you can create
and it received the prestigious EISA 16 User Presets with your own labels.
award for ‘Home Theatre Decoder of It also features excellent on-screen
1995’. display and extensive on-screen help
The proprietary DSP in 565 redefines for setup and calibration. These
expectations for movie sound and displays are available on the composite
creates a paradigm shift for music and S-VHS video connections.
listening by enabling immeasurably Best of all, the 561 uses the same
improved ‘stereo’ with 3 to 8-speaker powerful DSP processors, and
systems. The 565 provides for more algorithms as the highly acclaimed 565!
formats than any other surround
processor – until now.
Meridian Audio Limited, Stonehill, Stukeley Meadows, Huntingdon, Cambs, PE18 6ED, England
Tel: +44 1480 434334 Fax: +44 1480 432948 Web: http://www.meridian-audio.com
Product Information Meridian 561 January 1999
broadcasts and in computer level to around +15dB, the resulting
Movie formats multimedia. bass energy can still be incredibly
It was natural that when Meridian Finally, in addition to AC-3 and demanding for even the very best
turned their attention to Pro Logic and MPEG, the 561 will decode DTS. The systems – and equally important – may
THX, the only way they could satisfy processor fitted to 561 is fully capable be disastrous for other, less capable,
their exacting standards for clarity, of decoding all the DTS formats seen speakers.
transparency and function was to on DVD – as well as DTS from The Meridian 561 incorporates a very
develop the whole thing from scratch LaserDiscs and CDs. sophisticated series of bass protection
using only the best hardware and schemes for digital surround formats.
software DSP techniques.
Like in the Meridian 565, all the
How does THX fit in? The overall amount of LFE added in
THX Cinema has a huge amount to can be controlled by the user. In
surround processing is performed in addition, the 561 has a bass limiting
powerful audio computers, using offer in the 5.1 era. The 561 has all the
signal processing in place to comply function to control the total amount of
algorithms and code developed bass passed to the system.
uniquely by Meridian. This approach with THX requirements for Dolby
Digital, DTS and MPEG. The front As well as the overall bass protection,
has allowed our customers to obtain the 561 can monitor all eight speaker
hardware and/or software upgrades to channels carry re-equalisation; the
surrounds use a new timbre-match outputs. If the signal demands more
keep up with the latest sources. bass than a speaker can supply, a
The Meridian 561 uses three powerful curve and an updated de-correlation
technique. proprietary, psycho-acoustically
DSP processors to provide movie optimised limiting filter momentarily and
modes for Pro Logic, THX, ‘stereo
surrounds’ and Academy, and Music formats elegantly reduces the load on that
The 561 provides Meridian’s now- speaker. This unique protection method
decoding for Dolby Digital (AC-3), DTS, means you can get the most out of all
MLP and MPEG Surround. famous music-processing modes
including: Music, Trifield, Ambisonics, the speakers in the room without any
The Dolby Digital decoder built by fear of damage or unpleasant overload
Meridian is the most powerful on the SuperStereo and Music Logic – as well
as 2-channel stereo bypass and Mono. noises.
market and passes all the most
extreme bitstream tests. Dolby Digital is
the preferred audio format for DVD in Bass management Inputs and outputs
NTSC territories. The 5.1 signal has the potential to The 561 offers both analogue and
Dolby Digital is also available on require a 12dB increase in bass power direct-digital inputs and outputs. Eight
NTSC LaserDiscs – to replay these, a handling in a system. Not only can the digital and six analogue outputs provide
Meridian 519 Demodulator is also LFE (Low-Frequency Effects – i.e. 0.1) feeds for any combination of Active,
required. channel convey 10dB more bass, but Passive, Digital or DSP loudspeakers
MPEG Surround is the preferred the potential exists for that to happen in 12 different layout configurations
audio format for DVD in PAL territories; as well as full bass level in the other including up to 3 different subwoofer
however, MPEG audio is widely five channels. signals. Each output is individually
available – including US satellite Although the Dolby Digital, MPEG adjustable for type, sensitivity and time
and DTS encoders limit the total bass alignment.
Audio inputs Video outputs Movie and TV processing
8 analogue adjustable Tape outputs for composite and S-VHS Pro Logic, THX Cinema, Academy,
1 digital optical Main outputs for monitor of composite and ‘Stereo’ Surrounds, TV Logic.
5 digital coaxial IEC1937, IEC958 S-VHS
On-screen display for user and setup on Decoding for: MLP, Dolby Digital AC-3,
Audio outputs both composite and S-VHS DTS and MPEG Surround.
6 analogue for: main or sides, centre, sub S to composite conversion
and rear speakers
Controls and Display
8 channels digital output for: main, sides, Others Front panel controls for: Source, Copy,
centre, sub and rear speakers Flash memory for easy updates Mute, Display, Volume and Off. Other
2 analogue tape. Independent Copy RS232 for computer control, setup and features accessed using a Meridian
software updates System Remote (supplied).
Video inputs 2 Trigger outputs 12-character dot-matrix display; lights for
4 composite video inputs AC-3, DTS, MPEG and THX.
4 S-VHS video inputs Music signal processing
Mono, Stereo, Music, Trifield, Super
Stereo, Ambisonic, Music Logic.
Registered trademarks: “THX” and “THX Cinema” Lucasfilm Ltd; “Dolby”, “Pro Logic” “Dolby Digital”and “AC-3” Dolby Laboratories Licensing Corporation;
“Ambisonic” Nimbus Records Ltd; “Trifield” Trifield Productions Ltd; “Meridian”, “Boothroyd Stuart Meridian”, “MLP”, “Meridian Lossless”, “Meridian Lossless
Packing”, “LipSync”and “Meridian Digital Theatre” Meridian Audio Ltd; “DTS” Digital Theatre Systems Inc.; “DVD” DVD Forum.