SP-W350D Subwoofer 12” box design help

[SaLvia]

Hi all 

I have a SP-W350D Subwoofer 

I need your help with the box design
I can't use winlsd
The device's information as follows

SP-W350D Subwoofer 12” 2500 watts
• Nominal Diamete: 12 in (326mm)
• Mounting Depth 5.5 in (139.9mm)
• Rated Power (RMS) 350 watts
• MAX. Music Power 2500 watts
• Nominal Impedance 4 +4 ohms
• Frequency Response 25-1500 Hz
• Sensitivity (SPL/1W/1m) 84 dB
• Free Air Resonance (Fo) 30 Hz
• Suspension Compliance (Cms) 227u M/N
• Moving Mass (Mms) 125.5 g
• Mechanical “Q” (Qms) 9.9
• Electrical “Q” (Qes) 1.35
• Total Speaker “Q” (Qts) 1.19
• Equivalent Volume (Vas) 83.6 ltr
• DC Resistance (Re) 1.85 ohms
• Effective Piston Area (Sd) 510.7cm2
• Force Factor (BL) 5.65 Txm
• Voice Coil (V.C.) F50 mm, BASV
• Magnet Mass 53.4 oz (1880g)

 

 

My car Nissan Micra K11 ( 2000 )

luggage specs

W - 57cm

H - 38cm

L - 100cm

 

[SaLvia]

up 

thanks for helps

[GottemGood1214]

With them specs given it calculated a sealed box. This is what I found

[Joe X]

Here's the manufacturer's recommendation:

 

From this we supposedly know that Xmax = 25mm, 1 cube sealed box.

 

[SaLvia]

My manufacturer specs box design 45.0 liter

@Joe X recommended sealed 1.0ft3 = 28.3 liter

i was very hesistant 

I want to make the most right box when I do

 

 

[Joe X]

The enclosure you show is about 1 cubic feet internal volume, the 45 liters or so you mention is the external volume.
 

[SaLvia]

hmm

manufacturer specs is right ?

 

[Joe X]

Most 12" subs will work on a 1 cubic feet net sealed enclosure, however this sub seems to be designed to work in a infinite baffle setup like if you mounted it your rear deck without an enclosure, so the trunk acts as a large enclosure, not a standard one, modelling seems to show the sub needs more space:

Yellow is 1 cubic feet net sealed, red is 2 cubic feet net sealed:

 

You see the red plot gets more lows and peaks less and at lower frequency, here's how the sub would perform in an infinite baffle setup:

 

That looks nice to 50Hz except you need to keep 350W  - or else.