Best Subwoofer for Quad 2805 under $5k


Looking for musical subwoofer for 2 channel listening (Not home theatre!) that has the speed and finesse to keep up with Quad 2805s. Heard the Wilson Benesch Torus is an amazing combination, but don't want to spend $13k.
Thinking about the REL Gibralter G2 (carbon fiber driver) or the JL Audio Fathom f112. Has anybody tried these subs with the Quads? Any other thoughts?
vitman2020
check out the review of the VANDERSTEEN V2Q here in AGON
one of the fastest and most musical subs out there at any price

Review: Vandersteen 2Wq Subwoofer
Might want to take a look at the manepan bass unit:

http://www.magnepan.com/DWM_and_DW_1_Woofers
Experiencing great results using 2 REL B2 subs with Quad 2905's. After much experimentation seamless intergration was found in my room by placement only about 3 feet behind the inside edge of the Quads and toed inward.

Room resonances were controled with cast concrete blocks under the Rel's (aprox 25 kilos) and about 5" thick. Cones are placed under the front feet resulting in a backward tilt.

A pair of REL B2 or B3 here on can be had well under your budget and 2 subs are better than one in my subjective opinion.

I havn't had any experience with the subs in your enquiry and don't doubt their application, but I've found subs are like real estate ,location , location, location .

Keep us posted on what you end up with and the results, very interesting.

Regards.
I have used a pair of REL 505s and later the G1s with great success with the Quad 2905s. Superb subs, easy to blend as the G1s have a remote.