Ignore my last post. I was in the process of editing it after reading the Adire spec sheet when the BITOG editor timed out and wouldn't allow my changes. I include them below:
There are a couple different ported enclosure designs suggested by Adire, but none for sealed...they list an enclosure VOLUME for sealed, but they give no dimensions...that's why I didn't think the shape of the enclosure mattered, only the volume...
Remembering you posted some specs, I went back to have a look:
Vas is huge at 317 liters. This means a large box to start with, but the bigger the better. Very low Fs of 19Hz, which is fine. Large dia. VC and long linear throw of 33mm.
None of the various alignments give a spec for ripple in the passband. For a 2nd order alignment, you really want #3 which means a 6 cu. ft box in your living room, stuffed with 4 pounds of fluff....that's alot of fluff
The dB figure as quoted is only attained when 750W is applied! In HT though, we don't listen to sine waves as music/dialogue/tracks aren't at all the same. Also note the "assumed" dB gain levels that are figured into the results. Thus these figures need to be taken with half-a-grain of salt: What size cabin? What shape room? No spec for that.
In the vented alignments, the required box volume is very large indeed as is the multiple vent dia. and length. And remember, when using a driver of this size in any alignment sealed or vented, the box volume must be increased to account for the room taken up by both the driver and vent volume
. Volume must also be accounted for any lost due to bracing as well. Due to their higher order, they are more easily mis-aligned and as such, need to be carefully tuned in order to obtain the desired results. This means measuring equipment.
A good book to begin with is Ray Alden's Speaker Building 201
. May still be in print or you can borrow it from a library. If your local library doesn't have it, ask them to borrow it from another library that does. Libraries do this all the time.