KH 805 |
9
Positioning the subwoofers
Regardless of whether you are setting up one or several subwoofers:
X
Always ensure that the distance d
wall
between the wall behind the subwoofer and the sub-
woofer’s front is less than 0 .8 m .
If you are setting up
one
subwoofer:
X
Position the subwoofer against the front wall, slightly left or right of the middle of the front
wall and between the left and right loudspeakers .
If you are setting up
several
subwoofers as a Plane Wave Bass Array
™
(PWBA
™
):
X
Use two to four subwoofers for smaller rooms and three to four subwoofers for larger rooms .
X
Set up the subwoofers along the front wall within half a wavelength of each other . The max-
imum spacing of the subwoofer cabinets is determined by the setting of the routing mode
(see page 19):
Setting
Max. spacing of the subwoofer cabinets
RIGHT
approx . 2 m (6'6")
LFE (120 Hz)
approx . 1 .4 m (4'6")
LFE (WIDE)
approx . 1 .4 m (4'6")
DAISY CHAIN
depends on setting of first subwoofer
If you observe the stated spacing, the subwoofers form a cylindrical source and generate
a plane wave down the room, a so-called Plane Wave Bass Array
™
(PWBA
™
) . The PWBA
™
reduces stationary waves between the side walls, improves the bass reproduction and
suppresses lateral room resonances .
For examples of set up positions and distances, please refer to the supplied “Getting
Started Quickly” supplement .
You can correct excessive low frequency energy in the room using the potentiometer
SUBWOOFER GAIN | INPUT GAIN
J
and the switch SUBWOOFER GAIN | OUTPUT LEVEL
H
(cf . page 27) .
If you set up several subwoofers, you can utilize their mutual coupling to achieve an acoustical
gain . The following acoustical gains are possible:
Number of subwoofers
Acoustical gain
1
0 .0 dB
2
6 .0 dB
3
9 .5 dB
4
12 .0 dB
d
wall
Utilizing the
acoustical gain
