velodyne dd plus? still considered best of the best?

How about this:  https://destinationhifi.com/products/legacy-goliath-xd-subwoofer?variant=336275489

Of course not

I wouldn't buy a powered loudspeaker from a company that no longer services them or provides warranty service....stick to something with good warranty, and run some good room correction software and it will sound as good if not better than some old Velos.

+1 on paradigm defiance.  Absolutely tremendous subs for music and movies.  I sold my E112 stacked pair (poor mans / smart mans F212 pair) and I am running just a pair of X12 Defiance subs and they are unreal.  Just as tight as the JL, around the same output, yet they’re made in Canada and have the best room correction around (way better than the F113 v2 I had).  
The only caveat is that they are boring square boxes.  Although the woofer does look very cool.

See if you can find a local dealer that will let you take them home.  They will shock you.

I almost went with a pair of the Rythmik 12" subs.  But decided to go with the REL S3's because of their high level connection.  They blend quite well because when connected that way they act like an additional woofer to help extend the bass without it sounding too boomy.  However, I really like the direct servo technology uses in their Rythmik subwoofers.  However, since they are sold direct it was difficult to buy them without hearing them first.  I have heard they are very musical.