Checking Subwoofer Placement - Dynaudio AIR 15 Reference Manual

Checking subwoofer
placement
Fig. 32: Avoid placing the subwoofer on these lines
quarter or halfway between walls.
From the home screen, press the ENTER key.
►
"Bass Management" is displayed.
Press the ENTER key again.
►
"Select Mode" is displayed.
Press the DOWN key until "SC 120 Hz" is dis-
►
played.
Check the monitor position using low-frequency
►
sweeps as described below.
Dynaudio Professional AIR reference manual – 2014-09-28
Low-frequency sweeps
The tracks 31 to 38 contains the following sweep se-
quences:
Track 31: 200 to 20 Hz
►
Track 32: 160 to 20 Hz
►
Track 33: 125 to 20 Hz
►
Track 34: 100 to 20 Hz
►
Track 35: 80 to 20 Hz
►
Track 36: 63 to 20 Hz
►
Track 37: 50 to 20 Hz
►
Track 38: 40 to 20 Hz
►
During the sweeps you will hear short "bleeps" indicat-
ing when the signal passes one of the ISO center fre-
quencies (see tables in the Appendix).
There are two "bleeps" every time the frequency pass-
es a whole octave center frequency and one "bleep"
every time the in-between 1/3-octave center frequen-
cies are passed.
Play all the low-frequency sweep tracks using only the
subwoofer. Mute all other monitors.
Checking and optimizing monitor placement
Evaluation
From your listening position, you should hear the sig-
nal 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, it should be set to
"LIN" with no frequency weighting. If the meter does not
have a LIN position, you can use the C-weighting, al-
though the response is attenuated approximately 3 dB
at 31.5 Hz and approximately 6 dB at 20 Hz.
In the Appendix, you can find instructions on how you
can alternatively use a studio microphone if you do not
have a sound level meter.
If the results are OK, proceed to "Calibrating the sub-
woofers with the main monitors" on page 61.
If the results are not OK, you must reposition the mon-
itors.
60