I'm currently auditioning the Athena AS-B1, AS-B2 and Paradigm Atoms in my home. My amp is an old Pioneer integrated. I also own a Sonic Impact T-Amp but I find that is sounds a little thin and bass weak in comparision so I don't use it too much.
First things first I do not care for the AS-B2, to my ears it is definately not superior to its little brother the AS-B1--other way around to my ears. I find the AS-B2 to be weak in the bass, to have a poor soundstage (sound is glued to the speaker grills) an overly bright tonal character and just an overall tizy, unrefined sound. It's a little more detailed and balanced in the midrange compared to its little brother but that's about the only positive thing I can say about it. The AS-B2 is not my cup of tea at all.
The AS-B1, on the other hand, is a very nice speaker. Its strength is balance--nothing about the frequency spectrum seems overly recessed or exagerated save for a little bit of roll off in the high frequecies but it's hardly noticable. Its tonal character is much more neutral and realistic than its bigger brother and it throws a pretty nice, believeble soundstage too. It also strikes just the right balance between transparency and hardness in the sound (unlike the AS-B2 which is too transparent--thin sounding--and the Atom which is too hard and thick sounding). The AS-B1 is really an impressive speaker for the price.
The Paradigm Atom (sorry, haven't heard the Titans) is also a good preformer save for some problems. The strength of the Atoms is in soundstage, tonal character and midrange. The Atom creates the best, most three dimensional soundstage of the three (in comparision the AS-B1s have a slight "sound glued to the grills" problem and the AS-B2 even more so), has a delightly warm tonal character (reminds me of Sennhieser's) and a great midrange that renders instruments more realistically than the two Athenas. But the Atoms also have a whole host of problems. For starters they are rolled off in the highs by quite a bit (much more so than the AS-B1s) and have a bad upper-bass hump that can really reak havoc with male vocals making them sound overly husky. Paradoxically, while the Atoms create the best soundstage of the three they also have the smallest sound--they have trouble filling the room with sound and creating a large sound image when compared to the two Athenas. Last the sound of the Atom is a little overly dense--it's hard, need more transparency--in this respect it reminds me of the closed headphones K271 and the semi-closed DT880--both of which feature an overly hard, dense sound to my ears.
Still, even as flawed as the Atom is it's still keeping up quite well with AS-B1. I still haven't been able to decide which I prefer yet but I bet I'm going to end up keeping the AS-B1 since it's the most balanced across the board. But I'll have to listen to some more music, watch some more movies and play some more video games with both speakers until I will be able to finally decide.