Have two subs, shopping for a sealed enclosure.
Here's the sub specs:

Nominal Impedance: 2 ohms + 2 ohms
Frequency Response: 24-600Hz
Sensitivity: 83Db
DC Coil Resistance: 1.85 ohms + 1.85 ohms
Inductance (LE) 1kHz/20kHz: 2.48 mH/1.06mH

More on it could be found here:
http://vault.alpine-usa.com/products/documents/OM_SWR-1242D.PDF



Here's the enclosure dimensions according to Alpine:

Mounting Depth: 172mm (6.8”)
Mounting Diameter: 231mm (9.1”)
Mounting Displacement: 0.05ft3
Sealed Box Volume Range: 0.5 – 0.8 ft3
Sealed box External Dimensions: 11.5 x 11.5 x 12.75”
Gross Internal Volume: 0.65ft3
Net Internal volume: 0.6ft3
F3: 49Hz QTc: 0.65

But a shop has now told me that those subs need more room than the .6 cubes per sub. They recommend something closer to a full cubic foot per sub.

Before I take that advice, does anyone here buy that? Has anyone tried the Alpine recomended enclosure and then something else to compare?

 

They work ok in .6, but much better in .8-1.0 cubes. If you need them in a small box then add about 1/2-3/4 pounds of polyfill for each sub...that will give you a virtual volume that is about 20-25% more. I've had the 12 in a 1.0 cube sealed (with 1 pound polyfill) box and it sounded very good...really tight, clean bass, and got more than low enough for music (could play tocata in d minor easily and shake the whole car).

 

0.8 cubes, lovely.

 

^^oh yeah, type r 10's in .8 sealed with 1/2 pound poly will sound great! Try it with and without the polyfill...it'll sound good either way, i just think poly helps to smooth out the bass a little more and give a little more extension down low.