74
Pressing
LOOK
brings up the following menu.
VOL: -20 dB
>C: 0 deg 0.0
L: -30 deg 0.0
R: +30 deg 0.0
The
deg
numbers are the look angles already established by one of several methods. (See
LOOK
ANGLES
under
MENU-SPK
.) C, L, and R are the look angles to be adjusted; select each in turn. For
the
C
adjustment, look centre; for the
L
adjustment, look left; for the
R
adjustment, look right. In each
case, compare the localisation of the image in the headphones to the image at the speakers, and use the
< and > keys to nudge the virtual image to the left or right. The adjustments affect each other, so the
process is iterative. A volume control for the headphones is provided at the top of the menu since the ^
and
v
keys are used for menu navigation. (To adjust the speaker volume, exit the procedure; engage
the test music loop by pressing
MODE
to choose
tSOLO
or
tMUTE
; press
PASS
to enter bypass mode;
adjust the volume using the ^ and
v
keys; press
PASS
to exit bypass mode. The speaker volume set
will persist into the
LOOK
procedure.)
When the process is complete, press
OK
or
EXIT
to save changes to the preset.
Logging azimuth with pilot tones
Pilot tones can be used to determine and log the azimuth of the front three speakers.
SPOS
(speaker
position) is particularly useful when speakers are behind a screen and their exact locations are not
known, but it can be employed any time the user finds it more convenient than other methods of
finding the speaker angles.
The user must be wearing the in-ear microphones. A headband (not provided) is used along with the
head-top clip to hold the head-top in position on the head.
First, run the
CAL
procedure to establish a good measurement level.
Then press
SPOS
to initiate the pilot tone procedure. The menu will say:
ASSISTED SPEAKER
POSITION CALIBRATION
CH1(L )
Starting with the left speaker, chirps similar to the calibration chirps are heard along with three tones
heard alternately. The highest and lowest repeating tones indicate that the subject’s head is pointing to
the left or right of the speaker, and the middle, steady tone indicates correct alignment. If it is difficult
to find the steady tone, the listener can use the ^ and
v
keys to loop through four thresholds, one of
which may be easiest to use.
When the subject’s head is correctly aligned as signalled by the steady tone, log the position by
pressing
OK
. If you are unsure that you captured the correct angle, you can press
OK
as many times as
you wish and the angle will be updated for the same speaker. Now use the < and > keys to move to the
next speaker and repeat the procedure. The < and > keys will loop through all assigned speakers, but
only the left, centre and right speaker azimuth can be logged with this procedure; the other speaker
labels are present for possible future use.
Our ears are not exactly symmetrically placed on our heads, so this method may produce a small error
in azimuth. For this reason, it is recommended that, if pilot tones are used to log azimuth, the pilot
tones also be used during the
SPK
(PRIR) procedure. (See
MENU-SPOS
below.) Then the same bias
in head angle will apply to both procedures and the error will not matter.
