As much as I understand the interest of the movement of the loudspeakers that the 10Hz sine waves could create, I understand less its interest because the loudspeaker from the Hadenys is supposed to start only at 20Hz.Most of the break-in was done in the first 24 hours for me. I did a comparison to other headphones after a few hours of music then another one around 15 hours of break in. The second round of comparisons showed some improvements, but later comparisons are fairly consistent with the second comparison that I did. They now have around 100 hours of break in and maybe 25 hours of music, but relative performance to my other headphones has stayed the same after the first break in session.
I do use 10hz sine waves instead of music to break in bass drivers on speakers and headphones has they allow lots of excursion without the heat, watts or audible sound and I find it a lot more effective than music. Since headphones only have one driver a 10hz sine wave at 80-85dB will soften the surround quite quickly as there is a lot more movement of the driver compared to most music.
On the other hand, burning-in with music is more important in my opinion, because all the frequencies work, and not just a movement based on the extreme low frequencies. This is essential for a successful burn-in.
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