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RE: HRSCF

Posted by rick_m on June 5, 2012 at 17:12:07:
"It is obvious that 100V ceramics are not suitable for mains;"

No, they are a little shy, of course if you plug your speakers into the mains that's probably the least of your problems.

"they are not suitable for high power amps either."

Let's see what a 100V capacitor is good for at the speaker...
Maximum allowable cap voltage: 100Vpk*.707=70.7Vrms.
Maximum RMS power amp limit due to cap.= 70.7^2/8ohms= 625W.

Probably not too risky.

"There is no problem in using polypropylene or silver mica caps for audio frequency use as filters; we are not talking about inductance effects which must be consdidered in digital signal applications."

Let's see how that stands up...
Impedance of 3,300pF@20KhZ= 1/wC =2410ohms

That's about 1/300 of the speaker impedance. If these things are going to help anything it's gonna be at RF and the inductance will likely matter.

BTW, silver micas are fine at RF, films not so much...

Regards, Rick