Size of a subwoofer enclosure - too big?

[Cyberzim]

Hello DIY'ers,

I have a little question about when designing an enclosure for a subwoofer.
My design is a 6th order bandpass with the total volume of 350 liter. My subwoofer's VAS is 230 liter. Can the box be larger than the subwoofer's actual VAS? According to WinISD then there shouldn't be any problems with excursion etc.

Regards,

Simon H.A.

 

[Arty]

maybe posting the driver specs (TS parameters) and the actual box You designed would help a great big deal more.
But .. I think the box size seems a bit fishy.

 

[Cyberzim]

Okay, here are the drivers specs:

Qes: 0,6
Qms: 13
Qts: 0,574
Fs: 30 Hz
Mms: 130 g
Cms 216,5 um/N
Rms: 1,88 Ns/m
Re: 6 ohm
BL: 15,8 Tm
Dd: 33 cm
Sd: 865 cm^2
Xmax: 8 mm (+/- 4mm)
Vd: 692 cm^3
SPL: 92dB
Peak: 600 W
RMS: 300 W

Enclosure:

Rear chamber: 240 Liter @ 45 Hz
Front chamber: 110 liter @ 85 Hz

Please note that this subwoofer is for outdoor application so I haven't choose the lower frequencies.

 

[Cyberzim]

Well, I won't use that enclosure design. I'm thinking about rear chamber tuned to 35Hz @ 250 liter and the front chamber tuned to 80 Hz @ 70 liters.
Actually I'm not sure what frequency range is best suited for outdoor. I'm thinking about 35-40Hz to 100Hz.