Wilson Sabrinas, electronics and Subs

In my in home comparative experience REL are not subwoofers. They are self described as a "Sub-Bass-System" because of their early rolling off.

Their speaker (high) level connectivity is just their old school output-less receiver connectivity remarketed by the new owners as amplifier matching BS. The idea is to match the speakers not their amplifier. REL does this by using a list of sub to speaker pairings. WTF?

Speaker matching is best done with detailed equalization and all the signal from a preamplifiers outputs. A REL may add a couple of sluggish Hz to those Sabrina’s but that’s it. Do your homework. Read subwoofer manuals setup instructions (not the positioning) compared to REL’s.

If your Wilson dealer doesn’t have a Wilson subwoofer on hand find a real Wilson dealer who does. You need a sonic baseline not shinny chrome.

stereo5, yes, I would imagine they're very expensive. The suggestion was not to buy them but simply to get a sonic baseline.

I'd suggest someone purchasing new Wilson speakers should shop for a subwoofer with a lower frequency response that could act as a master controller for more economically priced array units to add on as needed. Equilaziation and output connectivity could be confirmed by their user manuals online. 

As a result of my in home experience with the $8900. Studio III and the new company's reticence for any significant innovation to the original British design other than cosmetics, the only endorsement I could offer is that any sub/s is better than none at all.