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impedance compensation, [message #41958] Fri, 18 July 2003 09:53 Go to next message
Adam is currently offline  Adam
Messages: 419
Registered: May 2009
Illuminati (1st Degree)
I had a question for you guys. My fuzzy memory recalls a circuit that will flatten the impedance spike at a driver's resonance frequency, as well as the impedance spike that appears just above tuning frequency in a ported enclosure. However, I don't remember anything about the circuit, or how to derive the appropriate component values.

Can anyone help me out?

Thanks!!

Adam

Re: impedance compensation, [message #41961 is a reply to message #41958] Fri, 18 July 2003 10:42 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)

You could certainly use tank circuits to compensate for the peaks caused by mechanical and Helmholtz resonances. But such a filter will also change overall system tuning, so you would need to look at that and analyze the system as a whole.

Zobels and plain shunt resistance are dampers that will help with the tank circuit formed by interaction of the voice-coil and the crossover capacitors. They'll obviously have some effect on mechanical resonance too. But a Zobel will have very little effect because its impedance is high at low frequencies. And a shunt resistance will not damp mechanical resonance much either unless the value is prohibitively low.

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