Cambridge Audio AZUR 551R - Manual (Page 15)

Set the Decode mode as 5.1 or 7.1 by highlighting the Decode Mode item and
using the Left and Right arrows to scroll through the options:
Now move down and by highlighting each speaker in turn and using the Left
and Right arrows select from ‘Large’, ‘Small’ or ‘None’ for each speaker.
'Large' or 'Small' are used to describe each speaker in terms of bass
response, they do not necessarily reflect the actual physical size of the
speaker.
Large = Speakers with an extended low frequency response of approximately
20-40Hz to 16-20kHz (floorstanders or high quality larger stand-mounted
speakers).
Small = Speakers with a less extended low frequency response of
approximately 80-100Hz to 16-20kHz (small stand-mounted, bookshelf or
satellite speakers).
Setting each speaker allows the 551R to perform what is called Bass
Management and to direct low frequency bass from music and the Low
Frequency Effects channel of surround sound material to those speakers
best able to reproduce it. If you do not wish to use any of the speakers set its
setting to ‘None’.
The Subwoofer output can also be set to Yes or No. If no sub is being used
make sure this setting is set to No to allow the 551R to re-direct the bass
information in this channel to other speakers.
Note: The 551R will force some speakers to certain settings in the following
circumstances!
The Front Left and Right speakers may be ‘Large’ or ‘Small’ but never ‘None’
as they are always required for any type of music/movie reproduction.
Bass must always be reproduced by either the Front Left and Right or
Subwoofer channel (or both). Setting the Front Left and Right to ‘Small’ will
result in the Subwoofer automatically being set to ‘Yes’. Setting the
Subwoofer to ‘No’ will automatically result in the Front Left and Right being
set to ‘Large’.
If the Front Left and Right cannot reproduce low frequency bass a Subwoofer
must be used. I.e. If the Front Left and Right are set as ‘Small’ the Sub must
be Set to ‘Yes’.
Also, setting the Front Left and Right as ‘Small’ will always set the other
speakers as ‘Small’ (and the Sub to ‘Yes’). This is because LFE/ bass
information should not be redirected to the surround channels.
To store the setting simply come back out of the OSD (pressing the OSD
button always moves back one menu item, and then exits and stores from
the main menu screen).
551R azur
15
The following two sections can be performed by Cambridge Audio CAMCAS
procedure so you can if you wish jump straight to that section. However, it is
recommended that you do read these sections to understand the reasons for
these settings and their implications.
Speaker delay
Because the speakers in a surround sound system are usually different
distances from the listener the 551R incorporates the ability to apply a
variable digital delay to each of the channels so that the sound from each
arrives at the same time at the listening position for best surround-sound
effect.
To set the delay times automatically, refer to the Auto setup section of this
manual.
To set the delay times manually, simply measure the distances from the
listening position to each speaker as shown in the following diagram:
Note: No delay setting for the subwoofer is necessary.
Set the distances in the OSD Speaker Distance menu to the nearest value in
metres (1 foot = 0.3 metres). The speed of sound is approx 340 metres per
second, the 551R thus introduces approx 3mS of delay per metre of distance
set.
Go to the ‘Speaker Distance’ and highlight each speaker in turn. Set the
distance to the nearest value to that which you measured by using the Left
and Right arrows (the values do not need to be exact):
Press the OSD button to exit the menu.
Note: In addition to the delays as set above Dolby Pro Logic II/IIx playback
also requires an extra 15 milliseconds delay to the surround channels only.
This extra delay is part of the Dolby ProLogic II specification and ensures that
sound from the surrounds arrives just after sound from the front reducing the
audibility of sound leakage from the front to the surround speakers. Because
the relationship between the Dolby Digital and Dolby ProLogic IIx two delays
is fixed (15mS extra to the surround channels), it is only necessary to set the
delay by measuring the distances as we have described. The 551R will
automatically provide the appropriate extra delay whenever you switch to a
Pro Logic Mode.
2 1
3
7 6
4
8
5
1 = Front Left speaker
2 = Front Right speaker
3 = Centre speaker
4 = Surround Left speaker
5 = Surround Right speaker
6 = Surround Back Left
(when used)
7 = Surround Back Right
(when used)
8 = Subwoofer (can be placed
almost anywhere)
2. Speaker setup
Speaker Distance Menu
Unit :
Front L :
Front R :
Centre :
Surr. L :
Surr. R :
Surr. LB :
Surr. RB :
Return : [OSD]
Meters
2.9
2.9
2.9
2.0
2.0
2.0
2.0
Speaker Config Menu
Decode Mode :
Front L/R :
Centre :
Surr. L/R :
Surr. LB/RB :
Subwoofer :
Return : [OSD]
7.1
Large
Small
Small
Small
Yes
ENGLISH