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modified HPEQ. Of course, for this procedure, the real and virtual environments must match: same
room, same speakers in the same positions, and same listener.
The
MANUAL EQ
procedure works by presenting bands of pink noise one at a time. For each band
the listener matches levels between the speaker and the headphone emulation of the speaker. The
centre loudspeaker alone will be used for the comparisons. If there is no centre speaker and no
assigned centre channel, the left speaker will be used.
In
MENU-SVS
, set
DEMO
to
TILT
, allowing automatic switching between headphones and speakers
when the headphones are placed onto and removed from the head. In
MENU-HP
, verify that
RECALCULATE EQ
is set to
NO
(the default).
Load the HPEQ file to be modified into HPEQ memory location 64. Load a preset with the same
HPEQ and with the PRIR for the room, speakers and listener involved. Engage the preset.
Select
MANUAL EQ
and press
OK
to initiate the procedure. The screen will say:
MANUAL HEADPHONE EQ
BAND: 1
REL VOL:
REL BAL:
Within this screen, it is not necessary to move the cursor down. The ^ and
v
keys directly adjust
relative volume
(REL VOL)
and the < and > keys directly adjust relative balance
(REL BAL)
.
Upon adjustment, number values will appear for volume and balance:
MANUAL HEADPHONE EQ
BAND: 1
REL VOL: 0.0
REL BAL: 0.0
The first band presented is 0-500 Hz and is used to normalise the volume between the loudspeaker and
headphone-rendered systems. Adjust
REL VOL
,
and if the speaker image in the headphones is offset
left or right, use the
REL BAL
control to centre it. It is essential that this first band be matched for
level and balance, or all subsequent adjustments will be erroneous.
Then press
OK
to move to the next noise band, and repeat the volume and balance adjustments until all
the bands have been matched.
After each adjustment of volume or balance, the inverse EQ filter coefficients are recalculated and a
new filter is generated. This requires a short period of time, and the user will hear a brief click after
each adjustment indicating that the new filter has been generated and is operating.
The final signal is broad-band pink noise to allow comparison of the overall responses of the real and
virtual speakers with the new HPEQ.
Pressing
OK
will cause the entire sequence to begin again. In the lower bands, adjusting the volume in
one band will affect the volume in adjacent bands. Therefore it is important that the user make at least
two, and possibly more, complete cycles through all the bands. Ideally there would be a final pass in
which the user finds that all levels match and no bands need adjustment.
At any time, to stop the procedure and keep the changes, press
EXIT
. To stop and abandon the
changes, press
CANCEL
.
If the modifications are kept, the HPEQ file will show the letter “
m
” in its ID screen in memory
location 64. To save the file permanently, copy it to another internal memory location or to an SD
card.
