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4 SAVE ALL YOUR CHANGES AND RETURN TO THE SET SPEAKERS MENU
Once you have each channel adjusted properly, press menu to return to the
set speakers menu so you can continue the initial setup of your system.
set levels The AVP2 incorporates level controls for each channel. These allow you to com-
pensate for differences in amplifier and speaker sensitivities, and for placement
variations in different rooms. These adjustments are essential for reproduc-
ing proper soundstaging and image localization. Fortunately, they are nor-
mally a onetime adjustment during setup, and only need to be revisited if ampli-
fiers or speakers change.
The simplest and best way to adjust the output level controls is by using an
Sound Pressure Level (SPL) meter and the internal test tone generator. The goal is
to set the volume at the primary listening position to read 75 dB SPL (C-weight-
ing, slow response mode) from each speaker in sequence, using the individual
output level controls. An appropriate SPL meter can be purchased from Radio
Shack for about $35 U.S. (tip: buy the analog meter rather than the digital one).
You should point the meter at the ceiling in order to avoid inadvertently favoring
one speaker over another.
In the absence of an SPL meter, it is possible (though less desirable) to set the
output level controls by ear. Use the built-in pink noise generator in the AVP2 to
adjust all volumes to sound the same as they cycle around the various speakers.
(This signal uses bandwidth-limited pink noise to limit the problem of timbre shifts
between speakers influencing the setting of levels.) The system will then be rea-
sonably well balanced, although of course it is not “calibrated.” We urge you to
use an SPL meter as soon as practical.
1 ENTER THE SET LEVELS MENU
Select
set levels in the set speakers menu and press enter. You will then
see a screen which should look something like the following:
set levels menu
SET LEVELS
LEFT: 0.0 dB
CENTER: 0.0 dB
RIGHT: 0.0 dB
RIGHT BACK: 0.0 dB
R SURROUND: 0.0 dB
L SURROUND: 0.0 dB
LEFT BACK: 0.0 dB
SUB: 0.0 dB
As with the Set Distance menu, the Set Levels menu is dynamically updated
to reflect the choices you have made in the Set Configurations menu. For
example, Dual Drive speakers are sent identical amplitude signals to both
front and rear halves during calibration, avoiding the need for separate cali-
bration.
2 RAISE OR LOWER THE LEFT FRONT SPEAKER’S VOLUME TO 75 DB SPL AS
MEASURED AT THE PRIMARY LISTENING POSITION
Select the left front speaker by moving the cursor to that line; you can then
modify the setting by pressing enter. Use volume ± to adjust the volume of
that particular channel. Remember that you should be using the “C” weight-
ing curve and the “Slow” ballistics of the SPL meter in order to get an accu-
rate reading. Save your change by pressing enter again.