I think it’s important to note here that a distinction should be made: the new DT Demand Series Speakers seem to have honest specifications.
That said, there is little to no redeeming value in any of their previous products that I have found. My 2¢. Avoid their subs at all cost.
I actually had a DT salesperson tell me the same.
Also, there is absolutely no reason to match Speakers to Sub. There is no such thing as Timbre matching at low frequencies like that.
You should absolutely look for the best performing Sub you can allow yourself to afford.