Burn in Capacitor phenomena


Hello,

I just wanted to post about something I've just experienced with burning capacitors and a theory on a contributing reason to why they may sound different with time on them.

I made a capacitor burn in rig that play's music through the capacitors for burn in. During startup of this rig I noticed as the electric pulses of music pass through the capacitors they vibrate. That is you can hear the capacitors playing music. Over time I've noticed the volume or vibrational amplitude seems to have gotten slightly smaller. I am just throwing this out there, but my hypothesis is; that as electricity passes through, there is heating and swelling of the parts, the parts then undergo greater pressures and a greater sense of malleability and stickyness for a lack of a better word. These parts begin to Stick together and oils or plastics begin to settle into imperfections in the surface of the foils, ie: the parts meld causing a less ressonant (or perhaps a coupled resonance allowing the capacitor to resonate as a whole) sum of parts.

Why else would the capacitor become percievably less quieter? Other than a drop in frequency or less resonant.
perhaps because it's burning out, haha, I hope not.

Anyway I notice a difference in capacitor sound quality with time, and typically it sounds better as a less resonant capacitor probably would.

Thoughts?
scutterflux
All caps are apparently microphonic. That's why those tiny little 3 mm (contrained layer) VTS dots from Marigo when stuck onto the tops of all caps improve the sound.

Cheers
Caps vibrate to the music. I can't say that I have heard them play music but they do vibrate. This topic was discussed when I worked at Westlake Audio and the owner took this into consideration when he chose caps for his products.
The better sounding/quality capacitors do seem built to address the issue of resonance and they are better damped.
Duelund is a prime example of high effort to minimize resonance.
Regards,
Capacitor microphonics are easily detected at the surface with a sensitive instrument microphone. Try placing a phono cartridge stylus on the cap's surface and listen to it rumble with the music. We use a laser vibrometer to quantify it during the design process. Our ABX focus groups confirmed that microphonic behavior is a key determinant of sonic performance.

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its my understanding that most film capacitors are dielectric- 2 sheets placed side by side, then rolled tightly.Each sheet is one side of the electrical contact. During initial break in the voltage applied finds uneven gaps and a settling in process occurs where the use over time "irons out" the gaps because of the force of the voltage and the cap finally settles into steady state performance. Also possible that some chemical changes occur but chemistry isn't my cup of tea.