Arcam AV8 Handbook page 14

THX Surr.EX automatically sets the speaker selections for a THX
Surround EX setup with a pair of surround speakers, a pair of
surround back speakers and all filters set to 80Hz. This configuration
is not adjustable. Only select this if you are using a full set of THX
certified speakers.
5.1 Rear speakers defines how the speakers in a full '7.1' installation
handle 5.1 decoded sources.
Surr L/R redirects 5.1 surround signal to the surround left and right
speakers. No signal will be directed to the surround back left or right
speakers.
Surr Back L/R redirects 5.1 surround signal to the surround back left
and right speakers. No signal will be directed to the surround left or
right speakers.
Both redirects the 5.1 surround signal to both pairs of speakers with
the signal to each set reduced by 3dB.
3 – SPEAKER DELAY SETTINGS
3 - Delay Settings
Front Left:
Centre:
Front Right:
Surr. Left:
Surr. Back L/R
Surr. Right:
Subwoofer:
Note: Only enter these delay settings once you have specified what
delay units (i.e. Time, Imperial or Metric) you will be using, or the
information will be lost when changing units. If the delay units are set
to Time, then enter the delay in milliseconds for each channel.
The speaker distance control automatically sets the appropriate time
delays required for all the speakers in your system. To set up the
correct speaker distance, you must measure from the usual listening
position to the front of each individual speaker in the system. The
delay adjustment is not a substitute for proper speaker placement – it
helps to ensure accurate and correct signal arrival times from all the
channels to the primary listening position.
No measurement can be entered for a speaker that is not selected in
the previous 'Speaker Sizes' menu.
Surr
left
Surr Surr
back back
left left
Distance measurements for 5.1 [and 7.1]
speaker delay settings
3Ft
3Ft
3Ft
3Ft
3Ft
3Ft
3Ft
Sub
woofer
Centre
e.g. 3m
e.g. 4m
(9ft)
(12ft)
e.g. 2m
Surr
(6ft)
right
Surr
back
right
™ 4 – LEVEL SETTINGS
4 - Level Settings
™
Test Tone Cycle:
Front L:
Centre:
Front R:
Surr. R:
Surr. BR:
Surr. BL:
Surr. L:
Subwoofer:
Select Speaker for Tone
It is very important to calibrate the speakers correctly to achieve an
accurately centred sound stage. We recommend you use a sound
pressure level meter (SPL meter) to perform this part of the setup as
it is difficult to judge the levels accurately by ear alone.
Manual is best for setting up with an SPL meter as the test tone will
not change to the next speaker until instructed by you. Auto is best
for setting up by ear as the test tone changes automatically to each
speaker after a two second burst of sound.
On first installation, watch the OSD display as you cycle through the
available speakers with the test tone. Check that the speaker in use
corresponds to that indicated on the OSD. If there is an error then
check and correct the system cabling before proceeding further.
To calibrate the speakers with an SPL meter, place the meter at ear
level with the microphone pointing towards the ceiling, when seated in
the usual listening position.You will need to set the meter to '
with a 'slow'‚ response and to read 75dB SPL at the centre of the scale.
This volume is equivalent to normal conversation.
Each speaker can be finely tuned by 1dB increments to ±10dB. The
output from each speaker needs to be adjusted to the 75dB SPL
sound level. No adjustments can be made for a speaker that is not
selected in the previous 'Speaker Sizes' menu.
NOTE: If you do not have an SPL meter, simply set the front left
speaker to 0dB on the menu and then match all the other speakers
to this level.
14
Manual
---I--- +0dB
---I--- +0dB
---I--- +0dB
---I--- +0dB
Not Present
Not Present
---I--- +0dB
---I--- +0dB
‚ setting
C'