Doesnt resistance mean same as impedance??

That's it, I'm digging my eyes OUT.. Some of theses visuals are leading to a higher drug consumption. I'm gonna need a Thorazine drip pretty soon.

Regards

@emergingsoul I assume you know the difference between direct current (dc) and alternating current (ac). DC current has a constant amplitude and will not change with time. Amplitude of the ac current will change with time or frequency. Your ac power outlet looks like a sinusoidal waveform with 60 Hz frequency.

Think of your music signal as a collection of ac currents with frequency between 20 - 20,000 Hz. Audio signals are NOT dc, that will be highly problematic. There are protection circuits to prevent any dc current getting into the amplifier and then the speaker.

Impedance Z = R + jLw +1/jCw where

R = Resistance, L = inductance, C = capacitance, w = frequency and j = Square root (-1)

for dc current w = 0

Then Impedance Z = infinity. Which implies that dc current will not pass through a capacitor. You may have heard of dc blocking capacitors and that is how it blocks dc current.

As I said earlier, for musical signals w>0

Hence Z is a function of w assuming R, L, and C are fixed values. In short impedance can be written as Z = A (Cos x + j Sin x) where A is the amplitude and x is the phase angle. Cosine and Sine are trigonometric functions. Value of Z will vary based on frequency and that is why there are two plots speaker impedance. One is the amplitude as a function of frequency and the other is the phase angle as a function of the frequency.

When w = square root (1/LC), then Z = R. This is a special frequency where phase angle = 0. This is the only frequency where impedance equal to resistance. Rest of the instances, they are not the same.

Impedance and resistance are not the same thing when considering audio signals as shown above with the one exception.

@millercarbon thanks for the helpful answer

What MC said….