Originally Posted by SilverEars
One thing I'm not sure about is if damping actually even apply to planars. The frequency-impedance graph is flat, which means it's resistive because only reactive components would shoot up the impedance(correct me if I'm wrong). Since there is no peaks and etc, that means there should be no resonance, and therefore, the driver should be controlled without damping factor to be considered like the BA or dynamic drivers that have the resonance peaks(correct me if I'm wrong).
Is the width of the impedance hump q factor? Isn't there something about how controlled it can get depending on this factor? Here is from wiki:
In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how under-damped an oscillator or resonator is, or equivalently, characterizes a resonator'sbandwidth relative to its center frequency. Higher Q indicates a lower rate of energy loss relative to the stored energy of the resonator; the oscillations die out more slowly. A pendulum suspended from a high-quality bearing, oscillating in air, has a high Q, while a pendulum immersed in oil has a low one. Resonators with high quality factors have low damping so that they ring longer.
I don't think this is quite right. First of all, electrical damping occurs within transducers whether they have a wonky impedance curve or not.
I believe you are confusing electrical damping and mechanical resonances. The amp and speaker coil form an electrical circuit which may behave as an electrical oscillator with reactive components. The transducer is a mechanical system with stiffness and mass that behaves as a mechanical oscillator. These are two different oscillators... they just happen to be coupled by having the voice coil of the electrical circuit attached to the speaker cone of the mechanical system.
Electrical damping of the physical system occurs because the mechanical system has inertia. An electrical impulse may be applied to the speaker, inducing the speaker to move with some velocity; however, after the electrical signal has ceased, the inertia of the speaker proceeds to move the attached voice coil through the magnetic field of the speaker magnet. Moving the coil through the magnetic field induces back EMF (and if there is finite impedance in the circuit---e.g., low output impedance---an electrical current which opposes the motion) that will dampen the speaker motion.
What does result from wonky frequency-dependent impedance curves is that the damping ratio will vary with frequency; hence, some frequencies may be well controlled (damped) while other frequencies may be under-damped. This is a "higher-order effect" if you will.
Wikipedia on damping factor
Edited by ab initio - 7/8/14 at 12:51am