Here I am.
I owned the Veena, but although I auditioned the De Capo i in my den, it was a long time before the Veenas, and on lesser electronics. Clearly the Veena is capable of far more substantial bass. Voice on the Veenas was very lovely indeed;real presence there. The Veena may produce too much bass for smaller rooms, without de-tuning with acoustic fibre in the ports, which can be obtained through Reference 3a. That works well though.
If you don't need all the bass the Veena offers, does it improve substantially on the De Capo, or even the Dulcet (the latter for smaller rooms)?
I'd say that is a very subjective and room-dependent call. Between the De Capos and Veena, I wouldn't care to guess without more time with the de Capo on the same system. For my part, after some months I went back to the Dulcets;very content. I don't say they are the better speaker, but they may be ideal for some small room, near-field applications.
I never did buy the tube amp set-up that you would expect to optimize the Veenas or De Capos. At the time, I was trying different speakers to get the best out of a Naim system. My experience suggests, not conclusively, that the Dulcet may partner well with a broader range of SS integrateds. However, Naim and Reference 3a speakers did not make an ideal partnership, at least not for me.
UHF was a little lukewarm on the Veenas compared to the De Capos, but the review didn't reveal that a recent or direct comparison was done; I got the impression the editors were relying on nostalgia favoring the De Capo, and were tired when listening to the Veenas. A number of my friends do think the Veena far superior, more refined, and more complete. FWIW.
Cheers,
Paul