Meridian 861 Uživatelský manuál stáhnout pdf (Strana 4)

861v8

Reference Digital Surround Controller

optimised limiting ﬁlter momentarily and

elegantly manages the load on that speaker.

This unique protection method means you

can get the most out of all the speakers

in the room without any fear of damage or

unpleasant overload noises.

Sample rates & de-jittering

The 861 embodies the very latest

developments in digital audio, including

high sample-rate capability throughout.

Meridian, famous for smooth-sounding

digital audio components, has made

a major breakthrough with a memory-

based de-jittering system that renders

the processor almost entirely immune

to input-signal quality – making it by far

the sweetest and most open-sounding

controller that Meridian has built to date.

861v8 includes a new master clock and

associated circuitry that has made it

possible to reduce jitter to levels of 40% or

better below previous models.

Digital signals are upsampled to 24-

bit, 96kHz sampling using Meridian’s

unique ‘apodising’ ﬁlter and de-jittered

by a powerful DSP processor and FIFO

memory buffer, while analogue signals

are transferred into the digital domain via

precision high-sample-rate 24-bit Delta-

Sigma A/D converters.

Inputs

The 861 is a full-system controller/preamp

that provides seamless control of up to

12 analogue or digital audio sources. By

providing digital as well as analogue inputs,

861 can deliver radically higher sound

quality for sources that are originally digital

– like CD, DVD and Blu-ray Disc. As well

as accepting multichannel digital audio,

the 861 will handle S/PDIF-encoded Dolby

Digital, DTS or MPEG from sources like

DVD and set-top boxes.

Processing

The Meridian 861 is a digital processor,

and all signals are handled within the

digital domain. The processing engine

can consist of between two and ten

modular processor cards, each offering

an astonishing 300 MIPS of processing

power and housing multiple ultra-fast

processors running a variety of proprietary

algorithms to drive a number of different

possible outputs. These can be used to

feed a number of speaker layouts, ranging

from conventional 2- to 8-speaker stereo/

surround with multiple subwoofers (with

adjustable crossover parameters), to more

specialised layouts such as with-height

conﬁgurations and Ambisonic layouts such

as square/rectangle, pentagon, hexagon

and heptagon. Up to eight loudspeakers

can be active simultaneously, though

different setups can address different

combinations of outputs (for example, one

layout might use digital outputs 1–8, while

another might use digital outputs 1-6 and

two analogue outputs).

Algorithms include Meridian’s own highly

transparent Dolby Pro Logic IIx and Dolby

Digital implementations, MPEG Surround,

DTS, THX extensions, TV Logic and a

variety of award-winning music programs

including Triﬁeld and Ambisonics – in the

latter case handling both 2-channel UHJ

and planar B-Format sources.

Triﬁeld, recently brought to prominence

through its starring role in Meridian’s

automotive systems, actually decodes

a stereo signal to a three-speaker front

soundstage, providing greatly improved

stereo imaging and stability irrespective

of listener position, as well as extracting

surround information from stereo

recordings.

Meridian Room Correction

861 includes Meridian’s powerful Room

Correction system. A simple microphone is

used by the installer to measure a room’s

resonances. Software then computes

digital ﬁlters to control these resonances,

or “modes”, and uploads them to the 861.

The result is a dramatic improvement in

the sound, with reduced ‘muddiness’, and

enhanced clarity and imaging.

Physical Characteristics

861 architecture provides wide ﬂexibility –

future sources, formats and features can

be handled by upgrading software and/

or cards. 861 includes an advanced linear

power supply and a backplane with slots

for both digital and analogue audio cards.

The slots can be populated with a selection

of available 800 Series cards, the total

number depending on the owner’s speciﬁc

requirement (see over).

The 861v8 is available as a table-top box,

or in a rack-mountable version with or

without cover. It is supplied ﬁnished in

Graphite, Silver or Black; the full range

of Meridian Select colour options is also

available.

861V8DS v2.7 • 20121205 REƒwww.meridian-audio.com

Meridian Room Correction smooths out reverberation and resonance for a

cleaner, more precise sound without muddiness.

1 2 3 4

861 Core Layout 2

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