Filter
Top Products
27
CHECKING - SUBWOOFER PLACEMENT
Do not place the subwoofer on these lines quarter or
halfway between walls.
Overview
1 Main menu, set volume -20 dB
2 Main menu, select Bass Management:
120 Hz
3 Set Bass Management to “on”
4 Check the monitor position using the CD,
tracks 30-44
5 Go to: Calibrating the subwoofer with the main
system.
Test signals on CD
With the monitors you received a CD containing a lot of
useful test signals to be used for the set up of the monitors.
Low frequency sweeps
The tracks 30 to 37 contains the following sweep
sequences
Track 31: 200 Hz - 20 Hz
Track 32: 160 Hz - 20 Hz
Track 33: 125 Hz - 20 Hz
Track 34: 100 Hz - 20 Hz
Track 35: 80 Hz - 20 Hz
Track 36: 63 Hz - 20 Hz
Track 37: 50 Hz - 20 Hz
Track 38: 40 Hz - 20 Hz
Track 39: 32 Hz - 20 Hz
During the sweeps you will hear short "bleebs" telling when
the signal passes one of the ISO center frequencies. There
are two “bleebs” every time the frequency passes a whole
octave center frequency and one “bleeb” every time the in-
between 1/3-octave center frequencies are passed.
Play all the tracks using only the subwoofer.
Mute all other monitors.
Evaluation
In the listening position you should hear the signal smooth
and even throughout all frequency sweeps (bearing in mind
that the frequency response of the ear is not flat).
If you have a sound level meter this should be set to "LIN"
with no frequency weighting. If the meter does not have a
LIN position you can use the C-weighting, though the
response is attenuated approximately 3 dB at 31.5 Hz and
approximately 6 dB at 20 Hz.
In the background reading (page 39) you can find
instructions on how alternatively to use a studio
microphone if you do not have a sound level meter.
If OK continue to next chapter: Calibrating the subwoofer
with the main system.
If not OK you must find new positions for the subwoofer.
Next
Go to: Calibrating the subwoofer with the main system.
Air_US_rev_111.qxd 16-12-2004 14:17 Page 27