Best multi-purpose subwoofer


Best multi-purpose subwoofer - meaning it fulfills my pursuit for audiophile 2 channel listening and my home theater needs. I have a large TV room 22x22x8 (LxDxH) with floor standing Von Schweikerts VR4 speakers. Room is used both for dedicated 2 channel listening as well as home theater. Unfortunately the design of the room is not the best as it has glass on one side (leading to the backyard) and laundry room behind (meaning its also the family room). Currently I have a 8 inch NHT SW1 old subwoofer which needs an upgrade. The maximum dimensions I can afford on a subwoofer is  15x18x20 (LxDxH). 
As mentioned I want to be able to connect a High Level Input (for 2 channel) and .LFE for HT - so the subwoofer will need to have both. Grace for dedicated listening as well as power for HT. The only time I would consider a larger subwoofer is if it has wireless capabilities so I can place it anywhere in the room. 
Any suggestions on which subwoofer may work best for me? 
128x128ghulamr
ghulamr,

      You don't mention your budget but there's a solution that'll give you state of the art bass for both 2-ch and ht.  It's called the Audio Kinesis Swarm distributed bass array system.  Here's a review of it from The Absolute Sound magazine:

http://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/

     It's not cheap at $3,000 for the 4 (12" x 23" x 12") subs and the 1,000 watt class AB amp that powers the 4 ohm subs.  But I know it'll give you sota bass for music and ht because I've been using this bass system in my 23 x16 foot room for about 2 years now and it provides the best bass I've ever heard in my system. 
     I believe it would work very well, even in a room as large as yours, since it was designed for any size rooms from residential sized rooms to commercial club sized rooms.  
     Other big benefits of this system are that it provides great bass response throughout the entire room, not just at a predetermined sweet spot, and it requires no mics or room correction software or hardware, just some included equalization if you have some bass 'slap echo' present caused by bass sound waves bouncing between the floor and ceiling.  
     I run my subs configured as ported but the system does come supplied with port plugs if you prefer to configure the subs as sealed.  I compared ported vs sealed in my room and thought the ported configuration sounded better for both music and ht.   
     If $3K exceeds your budget, it's possible to create your own custom distributed bass array system using any 4 subs of your choice.  The only requirements are that you need to use at least 4 subs, although 3 may be sufficient in some rooms, and follow the specific sequential sub positioning procedure provided (which I can detail for you if you're interested.).  As the TAS review mentions, however, why bother when the Swarm system works so well and is so reasonably priced.  But it is true that the better the sub quality, the better the sound quality.  

Tim      
ghulamr,

     Are you ruling out a Swarm type bass system?

     If it's too expensive for you, I understand.  Prior to the Swarm, I tried multiple brands and models of single and dual sub configurations and positions in my room ( Velodyne, REL, JL, Hsu, Klipsch, Polk, B&W, Theile and a few others) and none performed as well as the Swarm.
     My main speakers and center ch are Magnepans, which are notoriously difficult to integrate subs with.   The Swarm system was the only system I tried that blended seamlessly with the Magnepans for music and still delivered the bass impact I wanted for ht.  It truly is a state of the art bass system. 
     I'm unaware of any single or dual sub setup using conventional subs, at any size or price, that can match the performance of the 4 moderately sized Swarm subs properly positioned.   I do believe, though, that utilizing 4 of almost any top line conventional subs properly positioned in a distributed bass array system would likely outperform the Swarm subs.  I've never personally tried this but I know it would cost about 4x or more than the $3K price of the Swarm and probably only deliver marginal bass response improvements.
     The 4 sub distributed bass array system is the result of years of research on in-room bass response conducted mainly by 2 PHDs in acoustical engineering, Dr. Earl Geddes and Dr. Floyd OToole.  Google their names if you'd like to learn more about their experiments, conclusions and White Papers.
     My intention is to share my many years of experience and knowledge trying to achieve the same bass response it seems you're now searching for.  I have no financial or other interests with Audio Kinesis/Swarm other than purchasing their bass system and knowing how well it works in my system.
      My opinion is that the single 15 x18 x20 sub that you are looking and hoping for does not exist.  Sorry, but it's as simple as that.  
     The $3K Swarm system is the least expensive solution I'm aware of that will provide you with the bass performance you described.

Tim
The storm is just 4 10 inch passive subs running off one 1000 watt amp.  
 Its pretty commonly known that 4 subs is an ideal setup for home theater,   I would get 4 subs and dsp and could be under the price of storm all day long.   And have dsp....