I wish I knew. I have the 2352's . Have made a set of 4355 filters as are on this forum, then mounted a small version LOOK alike of the A290, im not sure if the comparison is ok, but the 2352 does something I'm not able to replicate so far, even though the 4355 filter is NOT suited for the 2352 , it still sounded way BIGGER more spacious less comming out of the speaker, it somehow starts to fill the room without ANY power, with even the rubish TV broadcasts its like i'm actualy in a city when theres a movie for example.
the other smaller normal (non cd)horns gave an amazing sound but I gave up, nothing I ever tried could compare with the 2352 so far. BUT my problem is I want a bit more look friendly system, my system is HUGHE for a living room.
I also had dropped my eye on the A290, but I dont dare so far to take the risk, its a BIT expensive if it doesnt work like I want to.
Pictures of the horns setup I tried