Cambridge Audio 540D V2 - Manual (Page 14)

14
Dolby Digital Setup menus
When the Dolby Digital setup menu is selected, use the and
arrows to move to the desired menu. Use the Navigation arrows
( ) to adjust the settings and press the Enter button to confirm
your selection.
Dynamic
Dolby Digital encoded discs allow for the dynamic range (the difference
between loud and quiet passages) to be compressed (i.e. for late night
listening). The options are:
Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Off
When ‘Full’ is selected, the peak-to-peak value of the audio signal is
compressed by the maximum amount. When ‘Off’ is selected, no
compression is applied.
Channel Delay
For best surround-sound effects it is desirable to adjust the channel
delay so that sounds from each speaker arrive at the listener at the
same time. This is done by measuring the distance from the listening
position to the Left or Right Front speaker (which should be equidistant
from the listener), distance from the listening position to the Centre
Speaker and similarly to the Right Rear Speaker, Left Rear Speaker and
Subwoofer. See diagram below:
The measurements are not too critical so do not worry if your front
speakers are slightly asymmetric or about making very precise
measurements (+/- a foot or 30cm or so is fine).
The channel delay to be entered for each speaker is then the difference
between the distance to the Front Speakers and the speaker to be
configured.
So for instance if the Front Speakers are 5 ½ feet from the listener and
the Centre speaker 3 feet from the listener the channel delay to be
entered for the Centre Speaker is 2 ½ feet. Similarly if the Right Rear
Surround is 3 ½ feet from the listener the channel delay would then be
2 feet.
Note: The distance between the surround speakers and the listener
must be shorter than or equal to that between the front speakers and
the listener.
The units are feet for units sold in North America / Canada and metres
for units sold in Europe / Australasia.
Use to select each speaker in turn and to enter a distance
value.
The 540D V2 uses this to calculate and use the correct delay time for each
channel so that each channel reaches the listener at the same moment.
G o To D o l b y D i g i t a l S e t u p
- - D o l b y D i g i t a l S e t u p - -
D y n a m i c
C h a n n e l D e l a y
HDMI Audio
Two options are available PCM Stereo and Follow SPDIF.
When HDMI Audio is set to PCM stereo the HDMI output will be 16/44.1
for CDs and 16/48 or 16/96 stereo/stereo downmix for DVD depending
on the soundtrack bit depth.
When the 540D V2 is connected directly to a TV set able to receive
Stereo Audio over HDMI PCM Stereo is the best setting to use. Your TV
set will now always receive a two channel downmix from CDs or DVDs.
When HDMI Audio is set to Follow SPDIF the HDMI output will exactly
follow the SPDIF output as per the previous section and table.
When the 540D V2 is connected to an AV receiver by HDMI there are two
possibilities depending whether the receiver accepts HDMI audio
directly or switches HDMI video and uses SPDIF for digtial audio
reception:
1. For AV receivers that can receive HDMI audio set the HDMI Output to
Follow SPDIF. Now set the SPDIF Output to RAW/Bitstream. The AV
Receiver can now decode the bitstream over HDMI into whichever
formats it supports. The TV itself will normally now not receive any
audio (unless the receiver has the capability of making a stereo
downmix and outputting it over HDMI).
2. For AV receivers that switch HDMI and use SPDIF for audio reception
(such as our own Azur 540R V3 and 640R) set the HDMI output to
PCM Stereo and SPDIF Output to RAW/Bitstream. The AV receiver
now receives and decodes surround-sound via the SPDIF connection.
The TV will always also receive a two channel downmix directly from
the DVD player over HDMI which can be used if desired.
Pro Logic II
The 540D V2 can decode Stereo soundtracks (that have been suitably
encoded) into 5 channel surround-sound using Dolby Pro Logic II. Two
modes are available (Music and Movie), optimised for the different
Programme types.
To use Pro Logic II first turn it On and then select either Movie or Music
mode depending on the programme type.
Note: Enabling Pro Logic II decoding disables Dolby Digital decoding as
Pro Logic is used instead as you’d expect.
Audio Setup menu continued
1
2
4 3
1 = Front Left & Right speakers
2 = Centre speaker
3 = Surround Left speaker
4 = Surround Right speaker
5 = Subwoofer
5