Meridian 565 User Manual Supplement for DTS
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.
Pre-loading DTS
Manually
Obviously the LP source can be
DTS Delay
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.
Dedicated DTS sources
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.)
Automatic DTS operation
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
Using a 562V with the new 565
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.
Using 518 with the new 565
If you have a Meridian 518 Digital Processor, this will
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
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