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High-Pass Filter [message #66172]

Fri, 18 February 2011 09:07

Adveser
Messages: 434
Registered: July 2009
Location: USA

Illuminati (1st Degree)

Alright, so I noticed something playing with a band.

The speaker excursion of my all-in-one PA system is very high. The 5-band EQ on the thing only goes down to 250hz and I suspect that frequencies below that are responsible. I have a bass-heavy voice, even when singing well above middle-C and a heavy attack and am concerned it is going to blow the amp or the speaker. The clip meter comes on at the height of the attack and not really at any other time. I am pretty sure it wouldn't be clipping at all if I could tame the low-end and then I can get the full wattage of the system.

Does anyone know the values of the capacitor and the resistor I would need to make a 200hz high-pass filter off the top of their head that I could wire directly into the microphone's shell?

A windscreen is simply not going to be good enough.

http://adveser.webs.com/

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Re: High-Pass Filter [message #66182 is a reply to message #66172]

Fri, 18 February 2011 13:49

Wayne Parham
Messages: 18785
Registered: January 2001

Illuminati (33rd Degree)

If you want just a simple RC filter (first-order), make the shunt resistance equal to the source resistance and set capacitive reactance of the series capacitor equal to that at the frequency where you want crossover. Capacitive reactance (Xc) = 1/2πfC. Since you want to find capacitance where reactance is known, use this formula instead: C = 1/2πfXc. Capacitive reactance (Xc) is in ohms and (f) is frequency in Hertz. Capacitance (C) is in Farads, so it will be very small. Remember that uF is x10^-6 and pF is x10^-12.

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