As an Avantgarde owner, I would like to share my personal experience with the dealers and the company.
I bought my pair new from a dealer about 1 1/2 years ago, and it was delivered directly from Avantgarde factory in Germany to my door.
Speakers were absolutely trouble-free, not even a hint of a problem.
I've met Armin Krauss, one of the Avantgrde principals many times in person at CES, even before I bought my pair, and he's nothing, but very courteous and very attentive person.
None of the arrogance and "HI-Fi" attitude, some people in the industry exhibit.
Since I've had my speakers, I had a number of technical questions, and Avantgarde never failed to respond within 24 hours with very friendly and detailed explanations.
When Armin was away on a business trip, some other guy (I forgot his name now) took over, and answered my concern as promptly.
In lieu of my experience, the OP thread sounds very suspicious and questionable to me, to say the least.
I could imagine, Avantgarde speakers are not immune to technical failures, like any piece of electronics, and since the problem with his speakers occured immediately after delivery, I would certainly suspect shipping damage, like a loose contact, or something else of similar nature, as a culprit.
If I were him, I would also be much more careful about posting my assumptions and accusations in the open forum under these very circumstances- it can damage a good company reputation for sure, and Avantgarde, as a company, deserves much better.
As a last comment, I know quite a number of current and past Avantgarde owners, and has never, even once, heard of a mechanical problem with their speakers. Call my sample biased, if you will, but that's a fact.