Why teflon dielectric instead of FR4 for high-end audio

[yelloww_]

teflon dielectric

Why using teflon dielectric instead of FR4 for high-end audio pcb ?

any ideas?


cheers

 

[guyaneseboy]

fr4 leakage

Possibly because the Er dieletric constant for FR4 varies widely. Teflon is used for high speed signals design, closely matched impedance control traces can be designed.
Guyaneseboy

 

[flatulent]

fr4 + leakage

It is probably just another way to claim superiority and justify a higher price. People who play golf will buy things on this basis also. It is the mechanical parts of the audio system (speakers and in old days phono pickups) that are the limiting factor in sound quality.

 

[FANT]

teflon capacitors in high end audio

Do you remember the neverending story with the oxigen free copper cables?.
Among the other things (Lower resistance, clearer signal, lower distorsion, ecc ) they claim to conduct better in one direction than in the other and for this reason are polarized.
At my work this is a DIODE ( even very bad ) and of course the response in ac will not be better than the other cables.
One way to pay 10 the value of 1.

Mandi

 

[mr_ghz]

I also see no reason using teflon instead of FR-4! Every capacitor in the signal path will give much more distortion than a frequency-dependend er! (This frequency-dependeces are only interesting at some GHz).
So: use FR-4 and be happy with the much lower price!

Bye

 

[drwho78]

The insertion loss due to Dielectric Absorbtion is less in Teflon. But it hardly matters in the audio range. FR4 is much cheaper to use.