ENCLOSURE RECOMMENDATIONS
woofer-displacement:
box type
optimisation for:
loud
normal
low / definition
sealed
net box volume [Liter] *
-
10
15
free field SPL at 90 Hz [dB/Wm]
-
87
86,5
mech. power handling [Watt RMS]
-
100
130
low cut frequency (free flield) Flow [Hz]
-
45
38
vented
net box volume [Liter] *+**
15
20
25
port diameter x length [cm]
5 x 17
6 x 23
6 x 22
free field SPL at 90 Hz [dB/Wm]
89
88
87
mech. power handling [Watt RMS]
100
100
100
high cut frequency for subsonic filter[Hz]
30
28
27
power handling with subsonic filter [W]
130
130
130
low cut frequency (free flield) Flow [Hz]
40
34
30
single vented band pass
net box volume [Liter] * V1
-
9
13
net box volume [Liter] ** V2
-
9
10
port diameter x length [cm] in V2
-
8,5 x 25
8,5 x 29
free field SPL at 90 Hz [dB/Wm]
-
88,5
87
mech. power handling [Watt RMS]
-
130
130
low cut frequency (free flield) Flow [Hz]
-
38
33
V 1 V 2
double vented band pass
net box volume [Liter] * + ** V1
13
15
20
port diameter x length [cm] in V1
5 x 23
5 x 27
5 x 23
net box volume [Liter] ** V2
11
11
11
port diameter x length [cm] in V2
10 x 20
8,5 x 16
10 x 29
free field SPL at 90 Hz [dB/Wm]
91,5
90
89
mech. power handling [Watt RMS]
100
100
100
high cut frequency for subsonic filter[Hz]
29
27
25
power handling with subsonic filter [W]
130
130
130
V 1 V 2
low cut frequency (free flield) Flow [Hz]
45
40
34
*): add additional 1,9 L for woofer!
**): calculate and add volume displacement of port(s)
formula: outer diameter [dm] square times 3,14 devided by 4, times length [dm]
ports should be rounded (aeroports)! In cases where round tubes don't fit,
channels with same cross-section (rounded at both ends) may be built.
damping: sealed encl. Fill loosely with poly-padding, vented encl.: 2 walls covered by acoustic foam.
enclosure wall thickness: MDF/Multilayer: 19 to 22 mm. Woofer screwed by metric thread knock-in nuts.
Subsonic-Filter: high pass filter of 3rd order or higher
mounting size:
mounting hole diameter:
183 mm
mounting depth:
111 mm
magnet diameter:
134 mm
recomm. freeplay behind magnet:
> 20 mm
if flange gets lowered into baffle:
without -
with rubber gasket
grinding diameter:
206 mm
212 mm
grinding depth:
14 mm
16 mm
ALPINE SWG-844 20 cm Subwoofer
0,9 Liter
Summary of Contents for SWG-1044
Page 11: ......
