Meridian America Boothroyd stuart meridian 565 Manual Do Utilizador

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Meridian Audio Ltd; “DTS” Digital Theatre Systems Inc.; “DVD” Toshiba and the Ten Companies.

DTS streams on the other hand are not flagged in

this way; consequently normal DACs and decoders
have no direct method of preventing you hearing the
compressed stream as a loud hiss.

The Meridian 565 detects the DTS signal and

switches to a DTS preset as quickly as it can. However,
even the 565 needs a short time to be sure that this
really is DTS. So, when you play a DTS LaserDisc you
may hear the compressed signal as a short burst of
hiss before DTS is identified.  As we have explained,
this is an unavoidable limitation of the way DTS is
delivered, not of the 565.

In Version 4.x software we have provided some very

useful workarounds, as described in the next four
sections.

Manually pre-loading a DTS preset, as described
earlier, avoids the hiss. To further assist, we have set
up the LP source to automatically load DTS for
LaserDiscs. So, if LP is selected before playing a DTS
LaserDisc, the DTS preset will be automatically loaded
and no hiss will be heard.

Obviously the LP source can be re-configured

differently if you need it.

There is an additional parameter in the source 

Config

of the 565. (See page 48 of the

 Installation guide.)

The display will read:

‘CD DTS Del. Y’.

This may be set to ‘Y’ or ‘N’. Setting it to ‘Y’ adds a
32ms delay to the audio for that source. Engaging this
delay allows the 565 time to detect a DTS signal before
it is played out, and therefore prevents the short hiss
occurring as the disc starts playing.

Setting DTS Delay to ‘Y’ is the ideal and

recommended solution to playing DTS from CD. This
setting is 

not

 recommended for video sources (such as

LaserDisc or DVD) because an additional 32ms audio
delay is equivalent to one video frame, and may affect
the 

Lipsync

 with the picture. (See page 28 of the 

User

guide

 for an explanation of 

Lipsync

.)

When you 

Type

 the 565 (page 20 of the 

Installation

guide

), the default settings for DTS Delay are ‘Y’ for

CD, Radio and CDR, and ‘N’ for LP, TV, Tape1, Tape2,
Cable, DVD, VCR1, VCR2 and LD.

As we described earlier, you can attach a DTS preset
in 

Config

 to one of the sources. The default

configuration attaches DTS to the LP source.
When such an attachment is made, the 565 will only
play DTS material for that source.

You can attach any of the three factory DTS presets,

or any DTS user preset in 

Config

. (See page 48 of the

Installation guide.)

If you want to ignore the short hiss that may occur at
the start of LaserDiscs, then you can just use the 565
as before.

CDs will always behave well because of the default

DTS delay.

If you follow this method, the 565 will load one of its

DTS presets automatically if a DTS signal is detected.
The preset that gets loaded depends on 

how the

source is labelled

 – as described below:

•

 

Label is ‘LD’ – loads DTS THX

•

 

Label is ‘CD’ – loads DTS CD

•

 

All others – loads DTS

For example, you can therefore force the 565 to use
DTS CD with the CDR source, by re-labelling it CD as
described on pages 48–49 of the 

Installation guide

.

There is an upgrade to the 562V software, Version 1.8,
which includes a DVD input for video and digital audio,
and also supports the LP key for DTS LaserDiscs.
Whilst not necessary to enjoy DTS material, it is
available from Meridian dealers.

If you have a Meridian 518 Digital Processor, this will

de-jitter a DTS signal for optimum sound quality.

However the resolution enhancement features of the

518 are not appropriate as DTS is a compressed digital
stream, not standard digital audio. Hence your 518
should be switched to Bypass mode prior to listening to
a DTS CD or LaserDisc.

There is an upgrade to the 518 software, Version 1.2,

which allows it to detect a DTS stream. In this case, the
518 automatically selects Bypass when DTS is
detected.

Version 1.2 adds four DTS modes to the 518 which

can be assigned to sources in 

Config

. The modes are:

•

 

DTSMU – 518 mutes on receipt of DTS (used
when 518 is a preamp).

•

 

DTSCD – detects DTS with a normal strategy and
selects Bypass.

•

 

DTSLD – detects DTS with a rapid strategy and
selects Bypass.

•

 

DTSMA – mastering processor mode ignores DTS.

These can be selected according to 

Type 

as follows:

•

 

Type 0 – all sources DTSMU

•

 

Type 1 – all sources DTSCD except DVD and LD
which are DTSLD

•

 

Type 2 – all sources DTSMA

© February 1997