Acoustic Suspension sound in 2020?

One of the finest speakers I heard during the 70's was the AR-LST.  There is no reason why they would not sound just as good today providing they have been properly restored.  You'll see them occasionally on Ebay, but they're not cheap!

I have Vandersteen 3A Sigs, and the bass enclosure is sealed, but I'm not sure to what extent the "active acoustic coupler" results in a different transfer function--I think it shares the same enclosure as the 8" woofer, but I'm not 100% certain.  

I think Yogiboy was making a (rather funny) joke, referring to the cutaway photo illustrating the guts.

Dear @aainpb : Not from the 70's but I own and am the original owner of a marvelous ADS L2030 ( heavy tweaked by me, you can read here:  https://systems.audiogon.com/systems/3080 ).

Those are acoustic suspension  and exist other two models: the L1230 and the L1530. This one along the 2030 were used as speaker monitors by Telarc recordings.

Even today my speakers are a true challenge for almost any speaker. Those ( especially. ) main silk made midrange and tweeter drivers are just extraordinary by any today standards.

https://gear.discogs.com/gear/68646-ads-l2030

this is a restored pair not tweaked ones:

https://audiokarma.org/forums/index.php?threads/ads-l2030-restoration.801968/

http://sportsbil.com/ads/l-2030-brochure.pdf


Why today exist only a few acoustic suspension speakers design? I really don't know.

Btw, M.Kelly was the ADS L2030 designer whom years latter founded Aerial Acoustic speakers and his today designs are not acoustic suspension but ported one:  ? ¡ ? ¡ ?

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

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.

The 1 has a transmission line vent and the Model 2 has what essentially functions as a passive radiator, and passive radiators act similarly to ports. Both speakers lack temporal snap in the bass which is the hallmark of a good AS design. 

Helomech, the acoustic coupler in the 2 and 3 is an active driver. Wondering if you know any technical details re how it essentially functions as a PR.

Would never, ever think that the bass in the 3 lacks snap, but of course that’s subjective and perhaps amp related.