Here's a set of Linkwitz Thor subwoofers, for sale in Mountain View.
Price: $800
*** No cables are included in the sale, even though they are shown in the photos. ***
The crossover was built by Don Barringer, Linkwitz's friend and official crossover builder.
The Thors use 1.5 liter Parts Express cabinets. These are are close to the same volume as the standard Thor subs. Any difference in sound is overshadowed by speaker placement and room acoustics. The drivers (not shown in photos) are the Peerless 83500, standard for Thor.
I also have Linkwitz Orion speakers and Emotiva XPA-5 amps for sale.
Please ask questions !