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http://www.edirol.net/products/en/R-09/specs.htmlInput Impedance Mic input: 20 k ohms, Line input: 17 k ohms

The Magic formula is:f=1/(2*pi*RC)f = frequency desired (in Hz)pi = 3.1415927......R = Input impedence of your recorder (in Ohms)C = Capacitor value (in Farads)

Quote from: hi and lo on November 01, 2007, 03:47:19 PMThe Magic formula is:f=1/(2*pi*RC)f = frequency desired (in Hz)pi = 3.1415927......R = Input impedence of your recorder (in Ohms)C = Capacitor value (in Farads)Never was any good at maths. Now I'm really confused... lol