"William Sommerwerck" wrote in
message

I did a little spread sheet and came up with the
following capacitances for 20 KHz and the three
resistances:

600 ohms 0.066314561 uF
2,000 ohms 0.019894368 uF
13,000 ohms 0.003060672 uF

Arny, why didn't you round off these values?

Quick cut-and-paste from Excel.

Also very wrong as Phil correctly pointed out

Reworked answers:

600 ohms 1326 pF
1,000 ohms 398 pF
13,000 ohms 61 pF