This widely reiterated piece of rubbish would have you believe that audio electronics, and even
cables, will “sound better” after a burn-in period of days or weeks or months (yes, months). Pure garbage.
Capacitors will “form” in a matter of seconds after power-on. Bias will stabilize in a matter of minutes (and shouldn’t be all that critical in well-designed equipment, to begin with). There is absolutely no difference in performance between a correctly designed amplifier’s (or preamp’s or CD player’s) firsthour and 1000th-hour performance. As for
cables, yecch... We’re dealing with audiophile voodoo here rather than science. (See also the Duo-Tech review in Issue No. 19, page 36.)
Loudspeakers, however, may require a break-in period of a few hours, perhaps even a day or two, before reaching optimum performance. That’s because they are mechanical
devices with moving parts under stress that need to settle in. (The same is true of reciprocating engines and firearms.) That doesn’t mean a good loudspeaker won’t “sound good” right out of the box, any more than a new car with 10 miles on it won’t be good to drive.