Set Levels Menu - PROCEED Audio Video Preamplifier Manual

output level controls. An appropriate SPL meter can be purchased from Radio
Shack for about $30 U.S. (tip: buy the analog meter rather than the digital one).
Y ou should point the meter at the ceiling so as 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 AVP to
adjust all volumes to sound the same as they cycle around the various speakers.
(This signal is bandwidth-limited pink noise to limit the problem of timbre shifts
influencing the setting of levels.) The system will then be reasonably well bal-
anced, although of course it is not "calibrated."
1 ENTER THE SET LEVELS MENU
Select
see a screen which should look something like the following:

set levels menu

If you have set up your configuration to include side speakers, you will
have levels settings for them, as well. Dual Drive speakers are sent identical
amplitude signals to both front and rear halves, avoiding the needfor sepa-
rate calibration.
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
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
3 REPEAT THIS PROCESS FOR EACH SPEAKER IN TURN
Pressing
speaker. When adjusting the subwoofer level, be sure to get up and walk all
around the listening area, watching for the magnitude of the variations in-
troduced by room modes at low frequencies. If more than 3-4 decibel
variations are seen within the listening area, consider relocating your
subwoofers for more consistent results. (See Planning Your Installation for
specific suggestions on subwoofer placement.)
4 MAKE A NOTE OF THESE SETTINGS UNDER "YOUR SYSTEM SETTINGS" IN
THE BACK OF THIS MANUAL
Having these settings handy will prove helpful should anyone ever tamper
with your careful calibrations. Of course, you should re-calibrate the system
whenever changing amplifiers and/or speakers, or when something has a
noticeable effect on room acoustics (such as rearranging the furnishings).
set levels in the set speakers
SET LEVELS
LEFT: 0.0 dB
CENTER: 0.0 dB
RIGHT: 0.0 dB
R. REAR: 0.0 dB
L. REAR: 0.0 dB
SUB: 0.0 dB
enter
volume ±
will move the cursor (and the test noise) on to the next
menu and press enter . Y ou will then
volume ±
. Use to adjust the volume of
enter again.
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