Dcstep, I actually found deep harmonic base to be one area that attracted me to the Helicons in the first place. In some respects, the mk1 was slightly better, but there were other compromises that I wouldnt go back to.
I use a few tracks for testing the extreme low bass including Bela Fleck's 'flight of the cosmic hippo'. Or try Sarah McClaughlin's 'i love you' (i think that is the track). Of course some orchestral pieces, and some Patricia Barber is good for this. Not sure what the frequencies are but they are low!
In my experience with quality amplification (especially high end solid state), the Dali's were superior to some of the others speakers in a similar price range. I tried Revel, B&W, Focal, and others.
I find the base a little thick and lacking in harmonics when they are too close to the rear wall, but as soon as you move them away, they come alive. Perhaps you should try this? Maybe it is just the combination of my system and room, and good cables with a tight bottom end also makes a difference. With some extreme high end cables, I got worse results in the base harmonics.
