Quote:
There are regular sceptics here who are persuaded by the evidence that there does appear to be something valid with regards to speaker burn in.
Two questions about Wavecor's measurements
1 - are the differences audible?
2 - will the speaker go back to its pre burn in state if rested?
1. The changes will make a difference, these drivers are for DIY projects, the mechanical specs of the drivers dictate how the speaker chassis has to be designed (bass reflex, backhorns and so on).
If the chassis is not designed very accurately the speaker will not be accurate, if you doubt this, then read up on speaker design, the more you read, the more you'll realize just how complicated speaker design is.
2. Who knows, but according to Weavecor they do change with use, my own bass speakers do not return to a pre burn-in state if not used for weeks, as for months or years, I don't know.
Notice that the changes Weavecor shows have to do with the mechanics of the driver, that makes sense as pretty much all mechanical devices change with use, and because the mechanical specs are extremely important in relation to chassis design.
When I replaced the GAMMA BK-3013a bass woofers in my speakers with Skytronic 902.222 woofers I learned that burn-in does happen for sure, at least with some drivers.
At first they sounded suppressed and compressed, they also had lower sensitivity then they do now almost one year after they got installed.
During the first 12-24 hours they loosened up and became more open, light sounding and sensitive, especially the sensitivity is easy to hear as they have to play together with two other drivers, comparing sensitivity between them is easy.
I also learned how important proper chassis design is, the bass reflex in my speakers is not tuned for these basses, so even though their specs are very close (within the Weavecor pre/post burn-in changes) the bass has a HUGE hump between 64 and 78 Hz.
With the GAMMA basses they did not have this problem at all, if I cover up the reflex tubes, the hump disappears, but the bass woofers sensitivity drops too low.