ENCLOSURE RECOMMENDATIONS
woofer-displacement:
box type optimisation for: loud normal low / definition
sealed net box volume [Liter] * - 15 23
free field SPL at 90 Hz [dB/Wm] - 88 88
mech. power handling [Watt RMS] - 125 100
low cut frequency (free flield) Flow [Hz] - 43 38
vented net box volume [Liter] *+** 20 25 38
port diameter x length [cm] 7 x 25 7 x 24 7 x 25
free field SPL at 90 Hz [dB/Wm] 90 89 87,5
mech. power handling [Watt RMS] 100 100 125
high cut frequency for subsonic filter[Hz] 28 26 22
power handling with subsonic filter [W] 150 150 150
low cut frequency (free flield) Flow [Hz] 40 35 27
single vented band pass net box volume [Liter] * V1 - 16 20
net box volume [Liter] ** V2 - 15 14
port diameter x length [cm] in V2 - 10 x 27 10 x 35
free field SPL at 90 Hz [dB/Wm] - 89 87,5
mech. power handling [Watt RMS] - 150 150
low cut frequency (free flield) Flow [Hz] - 36 30
V 1 V 2
double vented band pass net box volume [Liter] * + ** V1 25 25 34
port diameter x length [cm] in V1 5 x 19 5 x 35 5 x 29
net box volume [Liter] ** V2 20 15 14
port diameter x length [cm] in V2 10 x 17 10 x 25 10 x 34
free field SPL at 90 Hz [dB/Wm] 91 88,7 87,2
mech. power handling [Watt RMS] 125 150 150
high cut frequency for subsonic filter[Hz] 24 15 15
V 1 V 2 low cut frequency (free flield) Flow [Hz] 35 30 24
*): 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: 235 mm
mounting depth: 139 mm
magnet diameter: 134 mm
recomm. freeplay behind magnet: > 20 mm
if flange gets lowered into baffle: without - with rubber gasket
grinding diameter: 256 mm 262 mm
grinding depth: 14 mm 16 mm
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