"Burn in" Are you serious?

Bmpnyc:What I trust is my hearing and my mind. Feelings can undermine the evaluative process considerably. I've done the cable comparison many times with variously priced wire. New on trial and well-aged loans from curious and cooperative friends. I also have a significant part of a twelve guage roll which has never to my knowledge had a single electron flow through it. Equal unused lengths compared to identical original cut lengths (aged about 3to4 hrs. daily for 7 or 8 years) sound identical to my well seasoned ears and measure the same also. I do admit that I've not personally done this experiment with hyper expensive wire(over about $300 a meter(that's hyper expensive to me)). Perhaps physics and the "burn in" effect are cost sensitive. As I've said, I'm open to convincing proof otherwise. If the test is not truly blind to the listener, then it cannot be considered objective. Let me finish with two simple questions. Would you say that you honestly would not have ANY expectations when doing (e.g.) a sighted comparison between a Krell and a 1978 Pioneer receiver?...or between multistranded solid silver cable and a straightened-out coat hanger? ( if doable,try the coat hanger.You might be surprised) Best to all for the Holidays.

Waldhorner, I hesitate to make this seem even more wacky to you, but if you take a "burnt-in" cable out of a system and coil it up for a period and then put it back in the system it will go through the burn-in process again, albeit more mildly. I presume this has something to do with physical compression/decompression of the dialectric - whatever. You may doubt this effect, but you should take it into account when doing your tests between new and burnt-in cables. Personally I have not found a huge difference between new and burnt-in versions of cables like say DHLabs, but the differences seem to be more noticeable with more expensive cables. Perhaps the difference is quite subtle and only stands out against an otherwise pristine performance. The differences can sometimes be very unsubtle in the bass, but the nauture of the change is not usually a gross frequency response issue, but a change in grain structure or a change from seeming mechanical/electronic, to becoming more natural musically. The process is so repeated and unwelcome with any new product that it is hard to ascribe it to anything other than a "real" source. I know the following experience does not meet your objective test criteria, but in repeated visits to a friend's house I have heard how his system has burnt in. You may scoff at the aural memory required to support this claim - but I can recall how much more I was able to enjoy the music at each visit. How come my burn-in, if that was what it was, had the same gestation period as my friend's when he had an order of magnitude (or two) more exposure to his system? It is not this one experience that convinces me, but the many times I have observed the burn-in process.

Recently replaced my preamp/amp with an integrated unit (a demo, presumably already broken in) and my first impression was that the integrated had slower, more rounded bass and slightly elevated extreme high frequencies than the units it replaced. As the weeks have passed the amp no longer sounds this way. Is it burn-in, or have I acclimated myself to the sound of the amp? I can't really say it's one or the other. Probably a little of both.

If burn-in exists, I have no proof or indication. My psychological state seems to have more of an effect on how my system sounds than any burn-in. After the second beer my system sounds much better. If burn in exists, it is likely to be very subtle and gradual. With all due respect I am not convinced by any of those above who argue that there is a huge burn-in effect. Opening or closing a cabinet door neer my room reflection points, changing the position of the blinds, etc. has a much bigger effect on the sound than burn-in could possibly have. Do you have an anechoic chamber ? Then I may be convinced that you can detect burn-in.

I suspect your hearing is not sensitive to it Joe. This is not implying you don't hear well, because the effect is not gross, is not like the difference between having the blinds shut or open, or like the difference between two components. It is a quality that flattens images, takes a feeling of weight out of bass, adds a mechanical/electronic quality. And I don't care if you are convinced or not. I don't visit this forum to win arguments (which is not to say I don't fall into the trap of becoming embroiled in them from time to time) - just to share experiences with others - and your experience (and that of others) of not hearing components burn in is interesting and perplexing. But I feel no need to require you to prove that burn in does not exist. I cannot quite understand your concern about proof.