Vincent et al.,
What do you think the glass in the Perfect8 speakers might be? There's a pair in my living room right now, and they're simply divine. It seems to me that their dipole technology has a lot to do with the results; the room seems to be much less involved, and the speakers disappear. This is when listening to Pandora's Hawaiian music channel.
The glass is from a German foundry, and has a slight green tint to it.
Now, when you put on high-resolution material...
BTW if you read their White Paper, the glass/driver assembly has almost no resonance to it compared to more conventional arrangements.
NB