I have a 10 inch alpine type S (SWS1022D) and I'd like to have designs for a proper sealed enclosure and/or a proper 4th order bandpass. Please and thank you !

Here are the specs I have:

* Diaphragm Material: Aluminum Coated Poly and Kevlar Reinforced Pulp
* Displacement Front Mounted: 0.067 cu.ft.
* Displacement Rear Mounted: 0.086 cu.ft.
* Frame Design: Deep Draw with Vented Leg/Spider Plateau, Integrated Terminal landing
* Gasket Design: Injection Moulded Hidden Screw Design with Front/Rear Sealing
* Magnetic Weight: 50oz.
* Motor Structure Configuration and Pole Geometry: Extended Dual Flare Pole Vent, Compound Radius Curve( Patent #6, 639, 993)
* Mounting Depth (top mount): 153mm (6.1”)
* Mounting Diameter (top mount): 227mm (9”)
* Optimum Sealed Box Volume: 1.0 cu. ft.
* Optimum Vented Box Volume: 1.2 cu.ft,
* Recommended Box Types: Sealed/Vented/Bandpass
* Recommended Sealed Box Volume: 0.65 – 1.5 cu. ft.
* Spider Material: Nomex®
* Surround Design and Material: High Excursion Tapered Half-Roll, Injection Moulded Santoprene®
* Terminal Type: Heavy Duty 8ga. Push with Housing, Banana Plug Jumper
* Vented Box Volume Range, Vent Diameter/Length: 1.0-1.75 cu.ft., 3" ID x 9" Long
* Voice Coil Design: 4-Layer Dual Voice Coil
* Voice Coil Diameter: 38mm (1.5")

* Power Handling Capacity (Peak): 900W
* Power Handling Capacity (RMS): 300W

Thiel Small Parameters

* Coil Height (Hvc): 33.8mm
* Cone Area (Sd): 330 sq. cm
* D.C.Coil Resistance (Re): 1.8ohm + 1.8ohm
* Electrical Q (Qes): 0.67
* Equivalent Suspension Stiffness (Vas): 28 liters(1 cu.ft.)
* Free Air Resonance (Fs): 35Hz
* Frequency Response: 30Hz - 1kHz
* Gap Height (Hag): 8mm
* Impedance (Nominal): 2ohm + 2ohm
* Inductance (Le): 2.4mH / 0.90mH
* Linear Excursion (X linear): 12.9mm
* Magnetic Linear Excursion (Xmag): 14mm
* Mechanical Excursion (Peak-to-Peak): 44mm
* Mechanical Q (Qms): 13.86
* Sensitivity: 85 dB/W/M
* Total Loudspeaker Q (Qts): 0.64

whats wrong with just going with a regular ported box?

http://www.subwoofertools.com/forum/ported-box.asp

what kind of vehicle?how much room, you could always try the forgotten abc box

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4th order comes recommended and sealed is what I'm used to.

I don't have the room for a regular ported enclosure

a 4th order bandpass will likey be larger than a ported box and a ported will be larger than a sealed

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all 4th orders I have seen for this sub are a reasonable size. I played with that site you posted and most of the boxes around 40Hz were like 19 inches in one direction, that is FAR too large