Insomniac, i heard the Cardeas briefly at a show. After my arranged demo of Avantera, the store and importer, both told me Cardeas is way more demanding from room, position, electronics and cables. They also adviced towards Avantera. Perhaps due to the fact, i felt they were trying to tell me, system should be totally rearranged for the Cardeas.
Avantera was positioned well, but bass was shy compaired to my own PL 300. I found the top section coherent, but less resolving (example: hi-hat (open close, cymbals: crash, ride etc.
All was less resolved than my own PL 300. Bass seemed coming from rows back and not very coherent in soundfield. As that was not all, bass was heard as lower in volume and had no weight. The top section seemed way more forward. I grew tired even though we changed source and re-positioned them. I listened to sorted genres of musical styles, with very well known recordings for me. For the money, it was simply not worth it. I doubt i had even paid same as my PL 300. I could not settle for these, feeling at home. I listened 3 hours to be sure.
Even so, store claimed this was the best speaker they've used in this room. Looking at the room, i am sure my system had been doing better all in all.