De-emphasis curve for K67 capsules

RuudNL · Mar 14, 2013

Is there somewhere on the net a curve that shows the right de-emphasis compensation characteristic for a K67 capsule?
It would be easy to have a dB vs. frequency curve, especially if you have to check the performance of the electronics of a microphone.
But I don't know if something like that even exists!

Matador · Mar 14, 2013

This is the de-emphasis response of a U87-like circuit with various values of C6 roll-off capacitors (220pF is stock value):

You can see that these have -3dB points in the 5-7kHz range.

RuudNL · Mar 14, 2013

Great! This is very interesting information!

Gus · Mar 14, 2013

I guess you don't read my posts.

ricardo · Mar 14, 2013

Matador said:
This is the de-emphasis response of a U87-like circuit with various values of C6 roll-off capacitors (220pF is stock value):

http://www.musicalsparks.com/images/aurycle/a460_freq.jpg

You can see that these have -3dB points in the 5-7kHz range.

Err.rrh! This shows boost rather than the cut which the K67 capsule needs.

I summarize the available info on this subject in MicBuilders http://tech.groups.yahoo.com/group/micbuilders/files/Ricardo/ChinaMod%2BU87hybrid/. You have to join.

Matador · Mar 14, 2013

It's a boost below the response peak: so when the two Bode plots get added together it looks more "normal".

ricardo · Mar 15, 2013

Matador said:
It's a boost below the response peak: so when the two Bode plots get added together it looks more "normal".

I stand corrected.

Can you post a link to the circuit you have simulated please. This looks far too vicious for U87 or U67.

The MicBuilders document sits in a directory with a Steve Bores paper which explains some of it (for U67) but in a rather obfuscating manner.

De-emphasis curve for K67 capsules

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De-emphasis curve for K67 capsules

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