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DIY AUDIO & VIDEO TUTORIALS, FAQS, CALCULATORS AND EXAMPLES FOR SPEAKER BOXES, CROSSOVERS, FILTERS, WIRING, HOME AUTOMATION, SECURITY & MORE DIY AUDIO AND VIDEO .COM Resize Text: aA aA aA Toggle navigation Contents DIY Audio and Video Contents DIY AUDIO & VIDEO HOME PAGE Tutorials * Speaker Box Building * Crossover Design * Speaker Testing * Build a Microphone Guides & FAQs * Speaker Wiring * Home Theater * DIY Speakers * Speaker Box Construction * Using MDF * Speaker Crossovers * Sound Terms Calculators * Speaker Box Designer * Speaker Volume Calc * Sealed vs. Ported * Driver Displacement * 2-Way Crossover * 3-Way APC Crossover * Series Notch Filter * Parallel Notch Filter * Driver Attenuation Circuit * Impedance Equalization * Contour Network * Air Core Inductor Designer Entertainment Systems * TV Technologies * 3D in the Theater * 3D at Home * Home Theater PC * Types of Wires * Home Theater Setup * Component Wiring * Wire Conversions * AV System Wiring * Entertainment System Wiring Audio/Video Manufacturers * All Audio & Video Links * Home Audio Manufacturers * Pro Audio Manufacturers * Car Audio Manufacturers Crossover Tables * 1st Order Butterworth * 2nd Order Butterworth * 3rd Order Butterworth * 2nd Order Linkwitz-Riley Basic Electronics * Basic Electronics * Resistors, Caps, Coils * Resistor Color Codes * Audio Terms * Metric / Std. Conversions Sample Projects * Home Projects * Car Projects Notices * Disclaimer * Privacy Policy * Terms & Conditions * Contact Us Share IMPEDANCE EQUALIZATION (ZOBEL) CIRCUIT DESIGNER / CALCULATOR HELP Use the Impedance Equalization Circuit Designer. Impedance Equalization Circuits, also know as Zobel circuits, are used to counteract the rising impedance of a voice coil caused by inductive reactance. This problem mainly occurs in sub woofers because of their large coils. A Impedance Equalization circuit is usually placed after the crossover. Impedance Equalization Circuit is simply a capacitor (C) and a resistor (Rc) in series, in parallel with the driver. Re = Driver DC Resistance in Ohms Le = Driver Inductance in mH Example: Say you have a 8 Ohm tweeter with a Re of 5.7 Ohms with a Le of .08 mH The impedance curve for the driver would look like this. Actual Driver Resistance Desired Driver Resistance The impedance of the tweeter rises because of the voice coils inductance at high frequencies. Using the above formulas, C = 1.58 uF and Rc = 7.13 Ohms. Using the capacitor and resistor will help to flatten out the impedance curve. Experimentation is recommended to achieve the desired result. × Close Close © 1996-2024 Michael LaLena All rights reserved