Acoustic Suspension sound in 2020?

If you like the East Coast Sound of acoustic suspension speakers of the 60s and 70s, I would suggest you look for a good condition vintage pair of the AR, KLH, or Advent speakers that you mentioned. I am not aware of any modern speakers that replicate the sound of these speakers. If you want information regarding specific AR or KLH speakers, I would suggest posting on Audiokarma. There are many East Coast Sound speaker enthusiasts on that site.

Acoustic suspension is still the finest in overall bass quality and lowest distortion. Caveat: If properly done.

The end.

@yogiboy Vandersteen 2s and 1s are sealed-box enclosures, no? If no ports, therefore acoustic suspension, unless I misunderstand the definition. There is also an interview with RV in which he cites his inspiration from the sound of the acoustic-suspension designs of Acoustic Research, etc., -- the "New England sound" I think he called it -- when he designed the Model 2.  

@paulburnett
I’ve owned Vandersteens and they are not acoustic suspension sealed box enclosed. Take a look!
https://www.vandersteen.com/products/model-2ce-signature-ii

Spendor and NHT bookshelf/mini monitor speakers generally acoustic suspension.

I have several challenging installations (inside cabinet, on table, near rear wall or side wall, etc.) where sealed enclosures have advantages, so between the two brands I have five pairs of modern acoustic suspension speakers, all bookshelf/mini monitor.

Two of the five pairs are used exclusively for music (the Spendors, in secondary and third systems) and the other three across two H/T setups. The msrp’s of the five range from a couple hundred per pair for the low end NHT’s up to $2k or $3k per pair for the Spendors, and the Spendors are discontinued so either find used or old stock at this point. Of the NHT’s, the C1’s and Superone2.1 are current models.  Spendor has current models (A1, Classic 3/5 (or something similar, forget exact name, possibly others as well) that are acoustic suspension though.

Consequently, I also have a lot of subwoofers, because non-ported speakers give up some bass, haha...

Spendor D1, SA1.
NHT C1, Absolute Zero, Superone 2.1.

I’m not familiar with any of the speakers OP mentioned, so no idea whether any of mine sound like his/hers.

What I’d say generally is that I prefer well-done speakers with ports for fuller sound (despite my large A/S ownership share), but with challenging installations and/or small rooms, acoustic suspension can be a good choice, especially when paired with a good sub.