Not sure is he promoting certain brands to help sales as he probably gets the gear from friends hifi shop?
There is limits what such small sub can do. I have seen data for the earlier Kef R400b sub which is similar if not same sized and also dual opposite 9" drivers and 500w amp power. KF92 has doubled that (1000w) and new drivers. The R400 was great sub for music and performance from 40hz upwards was quite good, but below that it struggled. There is also in-room measurements for both SVS subs digging down to 10hz, but i don´t think any of these mentioned have that much output below 20hz.
You would get
four SVS SB2000 Pros with the price of
two KF92. Also Kef has shorter amp warranty (2years?) and the amp failures in past would give me little stress. It`s hard to know how KF92 really performs as there is no outside measurements to compare others. People test them in different sized rooms and smaller room surely helps with the room gain.
There is also JL E110, performance looks fairly similar to SB2000 Pro with extra headroom around the chest slam range. It´s small with mighty 10" driver and 1200w amp. 362mm x 343mm x 413mm HxWxD incl. feet&grill. JL is known to make quality subs with small size factor and superb gloss black finish. It`s premium brand so you will pay for that too. Then again JL has been making woofers long time and you won`t hear much of negativity from them. 1825£ gloss black, black oak 100£ less.
Powered Subwoofer with 10-inch Subwoofer, 1200 watts Applying a series of our key technologies, E-Sub powered subwoofers deliver exceptional sound quality, power and value in a wide range of demanding applications E-Sub drivers employ our exclusive DMA technology to optimize the drivers' motor...
www.jlaudio.com
PowerSoundAudio (PSA) is coming with the small dual opposite 12" sealed model. It should be 14" cube. Finish won´t be as sexy as with JL/Kef, but knowing Tom it`s going to be special product for much lower price than Kef.