Hi Patchwork,
Adire makes two ready-made subs that might meet your needs. The Dharman, a Shiva-based ported subwoofer, is better suited for home theater while the Rava, a Shiva-based sealed sub, is "ideally suited to integration in audiophile systems." You can check both of these subs out at
AdireAudio.com.
If you want to try out another Adire driver or perhaps one from Stryke Audio,
Acoustic Visions sells both finished and kit subwoofers at a fair price. I'd check it out if either the Dharman or the Rava/Rava SE is not to your liking.
The customer service I've received so far from both Dan Wiggins and Kyle Richardson has been excellent. When they're not on business trips, they both respond to any of my questions in a timely manner.
