Dynaudio pmn manual Checking - Subwoofer Placement, Overview

Air_US_rev_111.qxd 16-12-2004 14:17 Page 27

CHECKING - SUBWOOFER PLACEMENT

Do not place the subwoofer on these lines quarter or halfway between walls.

Overview

1Main menu, set volume -20 dB

2Main menu, select Bass Management:

120 Hz

3Set Bass Management to “on”

4Check the monitor position using the CD, tracks 30-44

5Go 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.

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