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Old 3rd April 2003, 07:45 AM   #1
Vatos is offline Vatos  Denmark
diyAudio Member
Join Date: Mar 2003
Location: Albertslund
Default Minature subwoofer

Can some help me with the cabinet for a minature subwoofer for this driver SPP-165S from Monacor (details below).

My dad wants a small sub to supplement his surroundspeakers and this quality is good enough for him.

Please someone with some software can you calculate a good vented box for me ??


HiFi bass-midrange speaker, 50WMAX, 8 Ohm
Speakers without magnetic interference, equipped with additional compensation magnets and screen cover, to be used also next to monitors, magnetic tapes, magnetic cards, etc.
With stable polypropylene cone, drilled pole core, and rubber surround, linear wide frequency response in compact cabinets, for miniature subwoofers, e.g. in active multimedia systems and of course for powerful 2-way combinations.

Technical datasheet
Impedance (Z) 8 Ohm
Free air resonance (fs) 38Hz
Max. frequency range f3–5,000Hz
Music power 50WMAX
Power rating (P) 30WRMS
SPL (1W/1m) 87dB
Suspension compl. (Cms) 1.40mm/N
Moving mass (Mms) 12.5g
Mechanical Q factor (Qms) 3.40
Electrical Q factor (Qes) 0.42
Total Q factor (Qts) 0.38
Compl. equival. vol. (Vas) 32 l
DC resistance (Re) 6.1 Ohm
Force factor (BxL) 6.6Tm
Voice coil induct. (Le) 1.2mH
Voice coil diameter 25.5mm
Voice coil carrier aluminium
Linear excursion (X) ±2mm
Eff. cone area (Sd) 129cm²
Magnet weight 8 + 5.4oz.
Weight 1.0kg
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Old 4th April 2003, 12:11 AM   #2
diyAudio Member
Join Date: Sep 2001
Hi Vatos, I don't know what you consider small, but one solution is a box of 28.4 litres internal volume (1 cu ft), ie 12 x 12 x 12 inches, tuned with a vent to 40hz using a vent flared on both ends of 50mm I.D. and 110mm long.
This will give you a cut-off of 40hz (-3dB)
A simple vent, flush on the outside (ie a simple carboard tube) will need to be 50mm I.D and 85mm long.

Hope this helps.

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