I would suggest the following 1) Aerial Acoustics SW-12 12" sub. For $4k to $5.5k, it's perhaps as good your going to find. It also offers infinite dial-in configurations and cabling options, xlr, rca, etc.. And the quality and craftsmanship is second to none. The SW-12 has received nothing but rave reviews by all professionals who have reviewed it.
2) If you're on a budget and a 'musical' sub is top priority, then I would suggest Bag End's Infrasub 18" subwoofer new about $1600 or used about $950. I have demo'ed it in my home and it is highly rated (by others) to be extremely musical. I could not believe that any 18" sub could be so tight.
3) I opted for Triad's Platinum subwoofer for $2k retail and I paid $1400 new. It's just a small step down from the Bag End sonically but offered me more configurations and options including auto-on/off. I have not been disappointed by the Triad's performance.
-John
2) If you're on a budget and a 'musical' sub is top priority, then I would suggest Bag End's Infrasub 18" subwoofer new about $1600 or used about $950. I have demo'ed it in my home and it is highly rated (by others) to be extremely musical. I could not believe that any 18" sub could be so tight.
3) I opted for Triad's Platinum subwoofer for $2k retail and I paid $1400 new. It's just a small step down from the Bag End sonically but offered me more configurations and options including auto-on/off. I have not been disappointed by the Triad's performance.
-John