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In Reply to: RE: Need help with corner frequency calculations. posted by Cougar on January 22, 2015 at 16:42:20
... a larger value cap than 0.33 uF.
If you play vinyl, then a cap with a corner frequency below 0.5 Hz would be advised (say around 0.2 Hz).
If you do not have a vinyl source, then a cap that will get you down to 1.5 Hz or lower would be advised.
At the -3 dB point for a single pole, the phase shift is already at 45 degrees.
Jon Risch
Follow Ups:
Jon,
Why use a lower cutoff frequency for vinyl?
Thanks,
reub
The warp frequency for records is 0.55 Hz.
Having a cut-off above that frequency will cause the capacitor to constantly charge and discharge due to the warp frequency excitation.
That kind of excitation will maximize the capacitor's dielectric signature, and exaggerate it's faults and foibles.
Without knowing if there is any upstream filtration, it is better to avoid the problem and keep the corner low.
CD and most other sources have built-in limitations for extreme low frequency response, and are generally incapable of generating such a consistently repetitious signal with nearly every playback event.
Just my take on the matter, and there are arguments for the opposite approach and filtering out the warp frequencies to the point of cutting into the audio band a little. Just remember to use a perfect capacitor in that case!
Jon Risch
Jon, Thank you for the info. I really appreciate it and hopefully I'm starting to understand how this all works now. :)
I will follow your advice.
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