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E-27E-26
English
Before you use your AV950/AVR750/450/380 it is
essential that you enter some information into the Setup
menus about your speaker conguration. is allows the
AV950/AVR750/450/380 to process any surround sound
digital source to exactly match your system and give you
the ultimate surround sound experience.
ere are three pieces of vital information which are
outlined in the sections: ‘Speaker Types, ‘Speaker
Distances’ and ‘Speaker Levels.
e way you enter this information manually into the
AV950/AVR750/450/380 is given later in the ‘Setup
Menus’ section on page E-28. e settings can also be
established automatically using the Arcam Auto Speaker
Setup function. However it is important to understand
why these speaker settings must be entered, which is
why this section is presented rst.
Speaker types
You need to set the type of speakers that you have
connected to your AV950/AVR750/450/380:
Large capable of full frequency range reproduction
Small not capable of full frequency range
reproduction at the low frequency end
None speaker not present in your configuration
e terms ‘Large’ and ‘Small’ do not necessarily relate to
the physical size of your speakers. As a rule of thumb,
ifaspeakercannotreproduceaatfrequencyresponse
down to about 40Hz (and very few can!) it is oen better
to consider them as ‘Small’ for setup purposes of home
cinema.
When a speaker is set to ‘Small’, very low frequency
sounds are redirected away from that speaker to a ‘Large
speaker or a subwoofer, which are far better suited to
reproducing these low frequency sounds.
Note that it is not possible to set all speakers to
‘Small’ unless there is a subwoofer in your speaker
conguration. If you do not have a subwoofer, you will
be forced to set your front speakers to ‘Large.
(Advanced users may wish to automatically override the
‘Small’ speaker setting for purely stereo music listening
when not watching movies. is can be achieved in the
‘Input Cong.’ menu – see page E-29.
essential
setup
Crossover frequency
If you have set any speakers as being Small, then you will
be required to set a value for the crossover frequency.
is is the frequency below which signals are ltered
away from these Small speakers and redirected to Large
speakers or the subwoofer (if present). A frequency of
80Hz is oen a good starting point, however you will
probably have to experiment with dierent values to nd
the best value for your system or consult your speaker
handbook.
Use Channels 6+7 for
If not used in the main zone, it is possible to assign the
Surround Back channels to bi-amp the Front Le/Right
channels or to provide an amplied output to Zone2.
Speaker Distances
It is essential for the distance from each speaker to the
listening position to be accurately measured and entered
into the ‘Setup’ menu. is ensures that the sounds from
the various speakers arrive at the listening position at
the correct time to recreate a realistic surround eect.
e distance can be entered in centimetres or inches.
Speaker Levels
Finally the levels of all the speakers in the system need
to be adjusted to match each other at the listening
position, again to create a proper surround eect. To
help with this the AV950/AVR750/450/380 can generate
a test noise for each speaker which should be measured
with a sound pressure level (SPL) meter. e meter
should be set to ‘C’ weighting and slow response. e
level of noise measured at the listening position from
each speaker should be adjusted on the Speaker Trims
page of the Setup menu so that the meter reads 75dB
SPL. It does not matter what the system volume setting
of the AV950/AVR750/450/380 is before turning the
test noise on as the volume setting is over-ridden for the
duration of the speaker noise test.
ere are several basic SPL meters on the market at
reasonable prices aimed at home cinema enthusiasts.
Check your local technology store, search online or ask
your dealer.
If you do not have an SPL meter, you can try to adjust
the noise level of each speaker by ear. In this case it is
not possible to adjust the speakers to the absolute 75dB
SPL volume level, but you should aim for all speakers
sounding equally loud. Setting speaker test noise levels
byearisnotrecommendedasitisverydiculttodo
accurately, but is oen better than doing nothing at all!
auto speaker
setup
ere is a proprietary automatic loudspeaker setup
function built into your AV950/AVR750/450/380. e
Arcam Auto Speaker Setup function attempts to set
all the essential speaker settings for all the speakers in
your system. It also calculates room equalisation (Room
EQ) lter values to remove some of the worst eects of
resonant frequencies in the listening room.
Your AV950/AVR750/450/380 package is supplied with
a calibration microphone, which should be inserted into
the AUX jack socket on the front panel and positioned
at the main listening position. is microphone picks
up the special calibration tones generated by the
speakers when Auto Speaker Setup is run. e AV950/
AVR750/450/380 then analyses the signal and computes:
<
which speakers are present,
<
speaker type,
<
speaker distance,
<
speaker level,
<
crossover frequency to the subwoofer (or large front
speakers if no subwoofer is present),
<
problem resonant frequencies in the room which
need control by ltering.
To help the system be as accurate as possible when
performing Auto Speaker Setup, there are a few
guidance rules that should be followed:
<
Minimise any background sounds in the listening
room and other nearby rooms.
<
Close all windows and doors in the listening room.
<
Turn o all fans including air-conditioning systems.
<
If holding the microphone in the hand rather than
mounting on a tripod or similar, keep your hand and
ngers still to avoid generating ‘handling noise.
<
Position the set up microphone pointing upwards at
roughly head height in the normal listening position.
It is not necessary to point the microphone directly
at the speaker generating the test tone. (It helps if
you are able to position the microphone exactly
where your head would normally be for listening,
with the microphone in direct unobstructed view of
all speakers.)
<
If your system includes an active subwoofer, start
by setting its output level / gain control to a value
halfway between maximum and minimum.
When activated, a calibration tone is played through
each channel of the AV950/AVR750/450/380 in turn,
including the subwoofer channel. e calibration tone
cycles round each of the speakers multiple times as the
dierent parameters are calculated. If you do not have
a full 7.1 speaker conguration there will be periods
of silence between some speaker channels. Follow the
progress’ information on-screen.
Aer all the channels have been measured, a summary
of the speaker conguration will be displayed on-screen.
You can then choose to accept the settings, re-measure
your system again or cancel Auto Speaker Setup without
storing the settings.
e Auto Speaker Setup function is found within the
Setup menus, see page E-30. By default, Room EQ is
not applied to any of the source inputs. You should
enable Room EQ on inputs you think benet from this
feature, as required, by listening when playing typical
source material through each input. is is enabled from
within the Input Cong menu.
While room equalisation can help to reduce problems
with listening room acoustics, it is usually far better
to try to solve these problems with the room directly.
Proper loudspeaker positioning, acoustic wall
treatments and moving the listening position away from
walls should produce far better results overall. However
itmaybediculttodothisinahomeenvironment,so
Room EQ is your next best choice.
Problems
We advise you to look over the reported measurements
on the screen following Auto Speaker Setup for any
obviously incorrect results, in particular to ensure the
reported speakers match your conguration and that the
speaker distances to the listening position appear look
roughly correct. If the results are not what you expected
re-run Auto Speaker Setup.
e Auto Speaker Setup function is normally quite
accurate but occasionally false results can be generated.
Problems may be as a result of:
<
external sounds or rumbling / handling noises
picked up by the microphone
<
soundreectionsohardsurfaces(e.g.windowsor
walls) close to the listening position,
<
very strong acoustic resonances within the room,
<
obstacles (such as a sofa) between speakers and the
microphone.
Ifyouarestillexperiencingdicultiesoryouwishto
have the most accurate results for ultimate surround
performance, we recommend using the manual method
of establishing speaker distances and levels.
Using a subwoofer
If your system includes an active subwoofer you may
need to re-run Auto Speaker Setup with the subwoofer
output level / gain control set to a higher or lower value,
if the summary screen reports problems setting the
subwoofer up.
Auto Speaker Setup will attempt to choose a crossover
frequency that allows the smoothest low frequency
transition from the main speakers to the subwoofer.
However if this does not produce pleasing results we
recommend manually trying other crossover frequencies
to nd something more to your preference.
See the next sections for information of how to enter or
change speaker settings manually.
NOTE
Auto calibration is possible only for a 7.x, 5.x or 4.x
speaker conguration. Other speaker congurations,
such as a 2.1 setup (le, right and subwoofer),
must be congured manually using the speaker
conguration menus (see page E-31), referring
to the guidelines on page E-26 for speaker types,
speaker distance and speaker levels.
16

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