I don't know if you would call it "recycling" old designs as much as I hope taking a new approach to old designs. I really don't think too many should be surprised by some of these design ideas resurgences. You talk about it from the 70's, I had a pair of Stu Hegemanns transmission line enclosures from the 60's just a while back, tweeter mounted coaxially and both woofer and tweeter firing upward, into an aluminum dispersion cone, same basic priciple. We all know tubes are incredibly popular, and vinyl is definitely stronger than it was 20 years ago. Some of it plays to nostalgia, some of it plays to people remembering a design and thinking that with new materials and advances in known sciences that these ideas are due another visit, perhaps working better with these new materials and ideas. I have a current fascination with transmission line enclosures, having just traded for a pair of IMF RSPM's,(the 1st pair of Ohm's were traded Sean) hooked up to an D76a I think its an incredible sounding system. Now I want to upgrade the xver, tighten up the response, change enclosure damping materials, etc. Why would Mirage not be having the same thoughts? At least I hope that s why they are doing it, not for the sake of the ad writers having to have something new to talk about.