It was a thought. Maybe it doesn't work that way with HiFi?
Heat could be applied in a temperature controlled environment. To simulate a reduced life expectancy due to heat, search out PCB hot spots and identify failing components. This is destructive testing though. If simply measuring cooling efficiency or some such metric it's good but the manufacturer could say that the test method does not represent average operating conditions. So room temperature environment and engaged often to simulate the operation of the respective device. It's a manual effort of manually operating each device near daily or daily and keeping a record of the tests for adding the details to the review as a chronological timeline of operation.It was a thought. Maybe it doesn't work that way with HiFi?
Otherwise, you drive the crap out of cars so you know what they can go for/manage. But ok, cars are not HiFi.
So you don't stress test electronics? Stress in the sense of long-lasting stress, not just when something is pushed into clippig for a short while for example?
As a retired semiconductor test engineer, that isn't always a good idea. It's possible to create what we call a 'walking wounded'. So a perfectly good device may break in the future because it's been weakened from pushing it too much.
This has to be an error. Sorry for the confusion. I'll let someone contact them to correct it.
Usually you send back the broken one and get a new one.
It sells, just like high horsepower cars and fancy watches sell. Who wants to buy mediocrity, even if it lasts forever? I know I don't want mediocre equipment, especially if I have to listen to it for years and years while I wait for it to fail.
But perhaps the simplest common metric to show the quality of the design?SINAD is not the only thing to think about.
AFAIK even the military doesn't do "100% burn-in testing" any more, for exactly this reason.
Yes, this is exactly what is done to find the wear-out characteristics of a population. The "back-calculation" is based on the Weibull distribution, see here for instance: https://www.itl.nist.gov/div898/handbook/eda/section3/eda3668.htm
. Also, temperature is a great accelerator for wear-out modes too. Both T and V can be stressed simultaneously.
Aha, interesting. Then that's it. I can't argue against that because you worked whit it/this. What I raised in my posts above are meant to be questions and not statements. Best to point out.
Well, I don't agree with you there. Something I use daily, I want to last a long time. A car for example.
It will be the usual, listening distance, listening volume, how dynamic the music is, speaker sensitivity.Last but not least: Does amp power really mean that much, for the home user? PA is another scenario, but at home, we listen at anywhere from 1 to maybe 5 m distances. A growing margin (myself included) has active speakers, so no standalone amp any more. From own experience: Yes I can drive the active speakers into protection, but I have to put on my Peltors first
Ceterum censeo: Facile dictu, difficile factu.
That was interesting. Today, for most people in Sweden, Wiebull is associated with this:Yes, this is exactly what is done to find the wear-out characteristics of a population. The "back-calculation" is based on the Weibull distribution, see here for instance: https://www.itl.nist.gov/div898/handbook/eda/section3/eda3668.htm
Weibull was a Swedish mathematician, who perhaps was obsessed with failure distributions in order to make cars that were extremely reliable, and boxy too.
You can estimate the life expectancy of all sorts of things by analyzing a population that has been run to failure.
The trick is to do the experiment at various accelerated conditions. For instance, groups of light bulbs could be aged to failure at various elevated voltages. The results of these accelerated life tests are then used to estimate the mean time to fail for light bulb when run at normal voltage (these various accelerated wear-out experiments allow you to calculate the values of γ, μ, and α that describe the Weibull distribution). Or you can be patient and let a population naturally wear out and do the Weibull analysis that way, but it takes a long time
But, like you suggest, this can all be back-calculated from a population that is run to fail, and we can all thank Weibull!
weibulls.com
Very nice!That was interesting. Today, for most people in Sweden, Wiebull is associated with this:
Weibull is owned by Econova, which is the Nordic region's leading company in soil and garden products and an innovative actor/ player company in recycling and biofuel.
(not the best translation but you get the point)
Weibulls Trädgårdsprodukter - Allt för din trädgård
Hos Weibulls hittar du högkvalitativa trädgårdsprodukter såsom fröer till blommor och grönsaker, jord till alla trädgårdens behov, gödsel, verktyg och tillbehör. Utforska vårt sortiment och få inspiration för att skapa din drömträdgård idag!
For the thread OT but ok:
www.audiosciencereview.com
@JohnYang1997 Hi there John don´t know if you can confirm two thinks (of this topic).
