Is there a better sub than the Aerial SW12?

I was very impressed with the Thiel SW1 in the dealer showroom, but my room has major "bass-suck" issues. Both the dealer and Shari from Thiel suggested that I might want to consider something in the Velodyne DD series (for my room, that is), and I somewhat reluctantly auditioned a DD-12. I was blown away. I know have a DD-12 in my system (Thiel CS3.6 mains), and it has amazed me. The hype in the Stereophile review is well-earned. For just over $2k, the DD-12 is a bargain, in my book.

Still, if I had the space and the necessary WAF for the big Genelec...

How about those top model (even the mid level Storm) REL Subs... Are you kidding me... Excellent Subwoofers that do not go boom boom boom.

My subs! Four adire tumults,four Adcom 555mkII's ( bridged mono ).A behringer 1124p parametric eq. I can get about 125db at 20hz.I had to be outside of the room.I have never heard bass like this.The Cabinets house two drivers in each, separate sub enclosures.They are two inch MDF ALL sides including the divider.Probably close to 350lbs. each. DIY RULES!

I use a stereo pair of Vandersteen 2Wqs. They use a downward firing, slot loaded set-up in a sealed cabinet, crossed over at 80 Hz. They are very reasonable--you can easily get two for the price (or less) of one these supersubs. The design avoids or minimizes many room and blending problems and uses phase coherent, passive crossovers, either XLR or RCA.
Good luck,
Jeffrey