Sub recommendation is tough due to each individual having a different opinion on how a sub "should" sound. Many different things to consider and think about
- What is "musical" (a term defined many different ways) to one individual, is boomy to the next.
- A good sub to one individual is high SPL levels, while quality not quantity is good to another.
- The room has a great affect on how the sub will sound
- Some love Ported Subs, other love Sealed Subs
- Some prefer Servo controlled, others don't
- Some love many small drivers, some love one large driver
- Some base it totally on testing data
- What is a "fast" bass driver? There are many discussions and document out on the net which discuss/argue this term.
- Try to audition them at home if possible - Internet only companies to demo will/may cost you some cash to send them back if you do not like them, but don't rule them out if you can
Here is a site to read up on some testing:
http://www.avtalk.co.uk/forum/index.php?t=thread&frm_id=50&rid=0&SQ=0
Here is another site to read up on reviews:
http://www.hometheaterhifi.com/masterindex_subwoofers.html
Then there is a forum where MUCH discussion goes on. The hard part is to weed through the many, MANY posts there and find the good posters who know what they are talking about:
http://www.avsforum.com/avs-vb/forumdisplay.php?f=113
The three sites will give you some starting points, but remember reviews are someone's opinion, and testing data is, well, testing data, you do need to listen and make your own decisions.
I just went through some of this when purchasing a new sub, and I found for my tastes and my room, I prefered a sealed servo controlled sub. I already had the Velodyne SMS-1 for Bass EQing, and I also use some Bass treatments, but I could use some more.
Dan