the.com/impedance
resistance with a grudge, fighting current and timing alike, plotting in the imaginary plane
two partsreal resistance plus reactive scheming, summed as a complex number
frequency-fussychanges its mind depending on the signal's speed
matching mattersmismatched impedance bounces signals back like a slammed door
measured inohms, same as resistance, but with attitude
audio nerds careheadphone ohms decide which amp can drive them