A super sub for a company like SVS doesn't make that much sense. If you want a super sub, just stack a couple PB13s or SB13s. By doing so, you have just doubled the performance of a single unit.
A company like SVS can not release a new sub on a whim. They have a worldwide distribution network, and they have to be able to support their subwoofers everywhere they available. They need to get a hold of steady suppliers, they need to meet regulations and certifications around the world, there is all kinds of contracts which have to be drawn up. A new product for them has to be tested through and through, because to launch a new product on a large scale would be disastrous if that product turned out to have hidden problems. And as size goes up, shipping becomes an exponentially bigger PIA, so again a super sub becomes problematic. It's very expensive for SVS to develop a new product, so they have to be sure it will make enough sales to be profitable, and that involves a good deal of market research, which of course, is another expense. In the case of some high priced super subwoofer, it's iffy, and it's more difficult to gauge its marketability and sales potential. Hardly worth doing for something that would only ever going to have a small fraction of the sales that their other lines have.
The fact is, very few people want a huge sub in their living room. Keep in mind, in most places around the world, housing tends to be smaller than the USA. They don't have the sprawling suburbs that we have, and population density is much higher. Footprint becomes a much bigger deal in a smaller room, but what is worse is close proximity of neighbors. For these reasons, I don't see SVS developing a super sub on the level of a Captivator. Like I said before, if you want Captivator level performance from SVS, just stack two or three PB13s, it's essentially the same thing.
For JTR's business model, its is much easier to deal with massive subwoofers. Since there isn't a huge demand for them, JTR doesn't have to deal with large quantities of anything. As I understand it, they are mostly built to order, and they have a lead time. JTR is handling a niche market to which their style of manufacture is amenable.
