Bonjour,
Voilà le retour de Thomas de SVS
Avant de copier coller sa réponse, je voulais souligner la réactivité et la qualité de disponibilité et de service de cette société.
Elle me surprend à chaque fois que je suis en contact avec eux. Chapeau bas à cette boutique qui est très sérieuse voire trop sérieuse par rapport à un grand nombre de ses concurrents et quelle simplicité dans leurs réponses, quel sens commercial, quelle franchise dans leurs réponses

Je suis bleffé
Good morning Jean-Denis
The SB16-Ultra is meant to set a new standard for compact subwoofers, and if it is to do so, it will have to be head and shoulders above the DD15. Not an easy task, but I think and hope that SVS has it under control.
A more direct competitor for the DD15 and its equals, will be the SB13-Plus.
No subwoofer, no matter what the sticker on the front says can get around the laws of physics, and for the very deepest bass the PB13-Ultra will be superior to the SB16-Ultra. The SB16 is for those who wants the best compact subwoofer, and for those who prefer the sound of compact sealed subwoofers.
There is no PB16 in the works. It would simply be too large to ship and to get in the door. The market for such a sub would be incredibly small, and we feel that multiples is a far better and more flexible solution if you need more output than what a single Ultra can give you.
Regards
Thomas