Home » Audio » General » Sanity check on low pass filter?
Sanity check on low pass filter? [message #819] Sun, 12 September 2004 17:16 Go to next message
wunhuanglo is currently offline  wunhuanglo
Messages: 912
Registered: May 2009
Illuminati (2nd Degree)
I want to implement a low pass filter to the balanced input of a sub amp. The amp's input impedence is 20K ohm.

I'm proposing to put a 10K ohm resistor in the Signal+ path, and a 0.47 uf cap after the resistor from the signal+ to signal-. I expect to get a 6db /oct low pass filter with a corner frequency of about 35 Hz.

Can anybody tell me if I'm in the ballpark?

TIA

Charlie

Re: Sanity check on low pass filter? [message #820 is a reply to message #819] Sun, 12 September 2004 20:14 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)
Hi Charlie,

You're right on the money. I'd probably double-check the amp's input impedance to be sure of what I was dealing with. But your first-order filter has the right components for 35Hz.

Wayne

Re: Sanity check - Thanks, Wayne [message #821 is a reply to message #820] Sun, 12 September 2004 21:43 Go to previous message
wunhuanglo is currently offline  wunhuanglo
Messages: 912
Registered: May 2009
Illuminati (2nd Degree)
I appreciate your help (as always)!

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