Originally Posted by plcomp
I must say that I'm also having a hard time with the "ppp burn-in". It must be remembered that all the PPP is providing to your units, is CLEAN POWER. I have a hard time understanding how burn-in on a power plant could have such a huge effect on a system, to vary between "it sucks" and "a huge improvement". May I suggest that, perhaps, the components had in the meantime cooled down. It sounds a lot more plausible to me, that more than 5 hours might be requied for a system to reach optimum performance again.
Everytime I turn off the system for a few hours it takes a long time for it to sound like before. When I turned it off for a day it took 1-2 weeks to get it back. I tried it again yesterday and my system sounds like crap now.
Everytime I unplugged interconnects it took 5 hours until the edginess was reduced so that my system was listenable again. Beyond 5 hours of burn-in the differences were small.
When I received my PS Audio GCC-100 amp I didn't hear a difference in burn-in, at least not the huge difference as others decribed. When I got my DAC, CD player, cables etc. I heard the burn-in the first few hours, but after that I didn't hear further improvements, it was disappointing because I was expecting more based on what others had said.
Burn-in with new gear usually lasts a few hours for me, why does it take few hours for me and a month for others? I believe it's mostly getting used to the new sound, some adjust to the sound faster than others, especially pro athletes. Or then I just have crappy ears and can't hear subtle differences. But I do hear a difference in ambient temperature while others don't, so it doesn't make sense. I hear a difference in blind tests too while others fail.
Long ago I got a new piece of equipment and listened an hour or so, I went to bed but didn't leave the system burning in. Next day I had adjusted to the sound and it sounded better. My brain adjusted to the sound while sleeping!
This is true with pro sports as well, the athletes do the adjustments and practice half asleep in their bed.
When someone gets a new piece of audio gear they are thinking about it when going to bed, it leaking into their dreams can't be avoided.
When someone installs a new piece of gear they get fatigued when bending behind the rack etc. This will be the main reason for flawed first impressions.
If they have been tweaking the system for 16 hours straight they are very fatigued. When I listened to my system right away it sounded very smooth because my body was relaxed, but next day the bass was too tight and gave me a headache. There are many variables you need to take into consideration, otherwise the impressions will be flawed.
What I do now is I let the system burn in a few hours before I take my first listen. I compensate for all the variables and always write my impressions down into my logs (I have many megabytes), that's how I can compare it to previous upgrades and variations. I NEVER trust my first impressions, they will always be flawed. Instead I wait 2 weeks to decide what the improvements were in the upgrade. This also reduces placebo effect of new gear and the smell of it. The smell changes how you perceive the sound. After 2 weeks you have adjusted to the smell and sound and then you hear the truth. However, it's hard to compare to your previous gear from memory, but I never had that problem, I can remember 10 years ago like yesterday. I believe all audiophiles have a good memory.