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Not doing much until above 40kHz

In terms of attenuating audio frequencies, you are right, as the fc for a 10 uH coil into a 4 ohm load is ~63 kHz However as, the late Al Sekela pointed out, RFI seeping back into the amplifer can cause stridency and harshness to the upper end.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia



Edits: 02/08/12

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