convert a ported sub into a horn

I’ve been reading various accounts of people using various tuba/wrecker type horns to great effect in their home theatres. I would like to build something similar but due to where I’m located the cost of importing all the gear is prohibitively expensive. I have a 12inch ported sub made by wharfedale- powercube 12 150w-kicking around- could I utilise the driver and amp in a horn/tl build and expect to get results better than what it already produces? Is it worth exploring further?

review of sub-http://www.audioreview.com/product/speakers/subwoofers/wharfedale/powercube-12-150-watt-powered-subwoofer.html
 
Thanks for your response,
I was hoping there might be a database somewhere with the driver information that I’ve been unable to find.
Looks like I’ll be sticking with an established design, the picowrecker is currently top of my list.
 
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I was hoping there might be a database somewhere with the driver information
Unlikely for a built-in driver. Have you considered measuring it? This
https://www.parts-express.com/Dayto...udio-Component-Test-System-390-807?quantity=1
although I don't know how much shipping is to...New Zealand? It's hard to see the flag by your name. You could also post a thread here and at other sites like
https://www.avsforum.com/forums/diy-speakers-and-subs.155/
and probably others including car audio sites, to ask if someone nearby can measure your driver. It's also possible to do it with a resistor and a good AC voltmeter (rated minimum 20-1000 Hz I'd say).

You can build a large box? That's the way to improve performance-a larger box and a matching driver for better total sensitivity at the bottom octaves, then 150W can play pretty loud. It's not likely a different box will improve the driver you have in the Wharfedale. Without measuring the parameters it's impossible to say if it is well suited to a horn.