Meridian G91 User Manual download pdf (Page 2)

G91 (above) with G68

In addition, the G91 provides a multichannel

digital output to allow connection to a surround

controller with multichannel digital inputs such

as the G68. Alternatively the multichannel

digital output and stereo analogue output can

be used to directly drive a basic 5.1 surround

system based on Meridian DSP Loudspeakers

and up to two analogue speakers (left and right,

centre, subwoofer, centre and subwoofer, or

rear left and right).

The G91 includes a powerful video processor

and scaler which can simultaneously provide

composite and S-video outputs, plus progres-

sive component video and up to 1080i on an

HDMI output. It provides two composite, three

S-video, and one interlaced component video

input, all of which can be routed to any of the

video outputs with appropriate scaling.

At the heart of the G91 is a high-speed comput-

erstyle DVD-ROM drive – the best type of drive

to use to ensure accurate data recovery from all

types of disc, while providing a stable platform

that can be changed in the future, if necessary,

to keep pace with new requirements.

The drive normally operates at standard speed;

however, it is capable of recovering data a

great deal faster when required, enabling it to

make more attempts to recover accurate data

from a problem disc. Because of this, the drive

can perfectly recover the data from almost any

compatible disc.

Unlike other players that use a mechanical

approach to attempt to lower jitter by minimis-

ing drive vibration, the G91 employs a triple

buffering system to minimise jitter, maximizing

HF transparency and sound stage precision and

stability. The result of this sophisticated ap-

proach is that the players deliver ultra-low jitter,

with sound and picture quality second only to

Meridian’s 800 Reference DVD/CD Player.

The digital electronics as a whole are driven by

a new design of high-stability clocking system

which further reduces jitter and ensures that

the highest level of detail is recovered from a

disc. All digital data is accurately re-clocked, and

multiple power supplies ensure that digital and

analogue circuitry are kept separate.

The G91 includes a comprehensive front-panel

user interface which allows access to all the

features of the unit. The player can be set to a

standard ‘Type’ which congures all the required

settings as required for a particular application.

In addition, an on-screen display (OSD) allows

you to congure specic settings individually.

The player employs Flash ROM memory for the

operating system, so software updates can be

downloaded from the Internet and installed via

a PC connected to the serial port on the rear

panel. The serial port also allows full remote

control and conguration of the unit.

The G91 provides three principal S/PDIF coax

outputs designated L/R, L/R Surround, and

C/LFE. These typically connect to Meridian pro-

cessors, or feed a stereo signal to a pair of DSP

Loudspeakers. If congured for MHR SmartLink

they, or the adjacent combined 15-way D-type

connector, carry high-sample rate encrypted

data from DVD discs for the highest delity of

decoding and reproduction. The SmartLink also

informs a connected Meridian processor of the

signal source, so that it can switch processing

modes automatically.

An additional S/PDIF digital output delivers a

stereo downmix or bitstream signal.

The G91 includes a preamplier and integral

radio tuner. The main stereo analogue preamp

output is either xed, or variable via the front-

panel knob which controls the Meridian propri-

etary digital/analogue volume control – a design

similar to that used in the 800 Series and DSP

8000. The tuner provides AM (LF/MF) and FM

(VHF stereo Band II) reception with RDS/RDBS,

and is tted with its own 96kHz, 24-bit A/D

stage. Digital signal processing provides a so-

phisticated FM stereo blend/width control which

allows you to minimise noise on a received sig-

nal. There is also a DSP-based low-pass lter and

a whistle lter for improved AM reception.

The G91 includes upsampling capability, which

allows digital lters to be placed far beyond the

range of human hearing, as well as offering

other audible benets right across the audio

band, including improved transient response. All

processing is at 48-bit precision. This results in a

more open, transparent sound, tighter bass, and

a generally more ‘musical’ sound overall.

To drive the analogue outputs, signals are

upsampled to 176.4/192kHz for digital to

analogue conversion – DACs can offer better

performance at higher sampling rates – and

88.2/96kHz is used for the digital outputs, all at

24-bit word lengths.

Here again, sending 24 bits at high sample rates

via an S/PDIF link reduces jitter as compared

with the original 44.1kHz, 16-bit signal from a

CD, for example. In addition, high-resolution

digital outputs are encrypted, removing cyclic

components from the data stream and further

reducing jitter.

All these advanced digital processing features

are handled by a powerful DSP engine delivering

an impressive 150MIPS (million instructions per

second).

In addition, the G91 incorporates digital signal

processing to allow the multichannel digital

output and stereo analogue output to be used

to directly drive a basic 5.1 surround system

based on Meridian DSP loudspeakers and up to

two analogue speakers.

The built-in surround processing system (soft-

ware update required) decodes 5.1 Dolby Digital

or DTS soundtracks from DVD-A or DVD-V discs,

or from the external digital inputs. It will also

create a full surround image from 2-channel

soundtracks on audio CDs, DVD-A or DVD-V

discs, or from the external two-channel digital or

analogue inputs.

Several DSP presets are provided to allow you to

choose the type of surround processing used for

different sources. For 5.1 audio formats a Dis-

crete or Cinema DSP preset is selected automati-

cally, depending on whether the source is music

or a movie. For two-channel audio formats the

DSP preset can usually be switched between Tri-

eld (recommended for music), Stereo (uses just

the main left and right speakers and subwoof-

er), or PLII (recommended for movies), using the

DSP key on the front panel or MSR+.

On the video side, advanced video circuit

designs, matched phase video lters, and a

broadcast-quality video encoder are employed

to deliver low-noise images of outstanding

colour depth and resolution. Separate ultra-

low jitter master video and audio oscillators

allow picture and sound to be independently

optimized, ensuring that the G91 DVD player

delivers breathtakingly clear pictures.

The G91 includes a unique broadcast-quality,

high-resolution video processor/scaler which

combines both Meridian and Faroudja DCDi

technology. This processor can receive

G91 DVD Audio Player Controller Tuner G91 DVD Audio Player Controller Tuner

The illustration right shows the G91 at the

heart of a compact Meridian-based stereo DVD

system. The Meridian DSP loudspeakers take

their feed from the G91’s digital preamp out-

puts, with the speaker volume controlled by the

G91’s front-panel knob via the communications

link, or via the remote.

With the G91, any kind of video display device

can be supported, whether composite, S-Video,

Component (progressive or interlaced) or even

the latest interfaces such as HDMI or DVI. Dif-

ferent video inputs are converted to all formats,

so there is only need for one display connection.

With three stereo analogue inputs and four

stereo digital ins (two optical and two coax), the

unit will support a wide selection of inputs, and

when playing a multichannel disc, it is expertly

downmixed to stereo.

In this analogue alternative to the system

shown opposite, the G91 is augmented with a

G Series stereo power amplier, such as the 2 x

100W G56 shown here, or the more powerful

G57. The G91’s analogue stereo output can

be either xed or variable, and in this case the

latter option is used. The power amplier will

drive any pair of conventional passive analogue

loudspeakers.

Once again, the video output from the G91 can

be selected from any of the available formats.

The analogue output is driven by a 24-bit DAC

stage that is upsampled to 176.4 or 192 kHz

for maximum delity, while the stereo analogue

output level is control by the front panel knob.

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T R I F I E L D 1

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Meridian G91 User Manual Page 2

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