Alpine SWE-1243E - Page 5

ENCLOSURE RECOMMENDATIONS
woofer-displacement:
box type optimisation for: loud normal low / definition
sealed net box volume [Liter] * - 25 34
free field SPL at 90 Hz [dB/Wm] - 89,5 89,2
mech. power handling [Watt RMS] - 200 200
low cut frequency (free flield) Flow [Hz] - 40 36
vented net box volume [Liter] *+** 32 32 55
port diameter x length [cm] 10 x 26 7 x 21 10 x 34
free field SPL at 90 Hz [dB/Wm] 92 90,3 89,5
mech. power handling [Watt RMS] 200 200 230
high cut frequency for subsonic filter[Hz] 28 25 24
power handling with subsonic filter [W] 300 300 300
low cut frequency (free flield) Flow [Hz] 42 35 27
single vented band pass net box volume [Liter] * V1 - 19 30
net box volume [Liter] ** V2 - 19 18
port diameter x length [cm] in V2 - 2 pc. 10 x 34 3 pc. 7 x 39
free field SPL at 90 Hz [dB/Wm] - 91 88
mech. power handling [Watt RMS] - 250 250
low cut frequency (free flield) Flow [Hz] - 36 27
V 1 V 2
double vented band pass net box volume [Liter] * + ** V1 25 37 45
port diameter x length [cm] in V1 7 x 32 7 x 25 7 x 36
net box volume [Liter] ** V2 24 23 23
port diameter x length [cm] in V2 2 pc. 10 x 20 2 pc. 10 x 27 2 pc. 10 x 36
free field SPL at 90 Hz [dB/Wm] 93,3 91,6 90
mech. power handling [Watt RMS] 250 250 275
high cut frequency for subsonic filter[Hz] 22 22 15
power handling with subsonic filter [W]
300
300
300
V 1 V 2 low cut frequency (free flield) Flow [Hz] 43 34 26
*): add additional 2,8 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: 282 mm
mounting depth: 169 mm
magnet diameter: 156 mm
recomm. freeplay behind magnet: > 20 mm
if flange gets lowered into baffle: without - with rubber gasket
grinding diameter: 306 mm 312 mm
grinding depth: 14 mm 16 mm
ALPINE SWE-1243E 30 cm Subwoofer
2,8 Liter
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