Tannoy Definition Subwoofer


Hello, Audiogon!
I am potentially interested in Tannoy Definition Subwoofer, the one that is currently on sale @ Upscale, link below.  Can any actual owners comment on performance and how well it complements main speakers?  It would be used in a 2 channel application supplementing modified Magnepan MG-12s.  Room is about 25x15, 8 ft. ceilings, placement is flexible, there are already some acoustic treatments in place.  Not interested in HT application at all, two channel bass extension only.  Huge thanks in advance!
https://upscaleaudio.com/collections/subwoofers/products/tannoy-definition-subwoofer?variant=3253046...
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No specifications available so you don’t know how low it will play, and you don’t know how much X max the driver has available, So it may just be a woofer not an actual subwoofer which will play down below 20 Hz which is what the word sub means
For a speaker as quick in transients and dynamics, I suggest one of the Zu subwoofers over the, the Undertone being closest in price to Upscale's blowout price. Zu's subwoofers are the only subs I've heard (including the Tannoy) quick enough to seamlessly match up to fast-transients, responsive speakers like Magnepan, Zu, Quad ESL, and similar.

Phil
Just a closeout price, not scratch & dent. Kevin bought them all, every unit the distributor had remaining, hence the bargain price. According to Kevin's video, it DOES have adjustable high-pass filter. Also, goes down to 15-19Hz, depending on room. Crossover can be set from 31Hz to 125. I have not auditioned with Zu or others, so can't comment on speed or matchup with such as Maggies. But you would have to think they match transient response with anything resembling full-range Tannoys. Plus there is a continuous phase adjustment dial that allows fine-tuning. Think I will grab one myself, two if necessary. FWIW.  

No real specifications listed. I'm suspicious and would not purchase them. Look at Martin Logan BalancedForce subs.