I have Boleros and if they have a flaw to my ear it's that the bass is a little loose. I think they'd actually sound better in a plain sealed box than with the passive radiator in the Bolero. Not as much extension, but tighter. I run a 'sub under mine anyway. Id like to hear a plain 2 cu ft 2-way with the 406 and these 3000g horn tweeters. Maybe as an experiment I'll pull the PR and stuff the cabinet, blanking off the PR hole with a fixed panel. That should be bliss.
At any rate, I'm not surprised you like the sound of the Maderas. I'm glad you posted tha tpic, as I was curious to see what the panel layout was like.