Why manufactures don´t burn in their amps and ...

i am not aware of any manufucturerer who will assert that cables which interface a component have no affect upon the sound of that component. most manufacturers willtell you to burn in the component before criticial listening.

regarding double blind tests to assess burn in, i would like to read the protocols of such experiments so i can judge for myself.

this hobby is so subjective that when you have 2 audiophiles in a room, you will get three opinions.

Insist on buying the demo unit from the dealer, if it is in adequate cosmetic condition to you ! With full warranty starting the day you pick it up ( which is usually the case ). Let him break-in the next one !

this hobby is so subjective that when you have 2 audiophiles in a room, you will get three opinions.
Mrtennis (Threads | Answers)

LOL!

Never heard that one.

With all due respect to the tangential discussions above, tje raises an interesting point: Why after paying a phenomenal amount of $ is it incumbent upon the purchaser to perform the break-in? I would think it makes more sense to have this done at the factory level as opposed to a dealer due to warranty ramifcations and the aforementioned stigma associated with buying a "demo'd" unit (versus new) from the dealer.
Couldn't the burn-in serve a dual purpose in terms of flushing out potential defects as well?

The tangential discussions are a reflection of the impacts and unease the buyers are subdued to when purchasing new gear. IMHO, we're still on track here.