What is Nominal Impedance?
Think resistance. But first a little background. All electrical devices resist the flow of electricity to some degree. Because they resist at some frequencies more than at others, engineers thought they would confuse the layperson. Thus they chose the word impedance instead of resistance. But the concept is the same. The nominal impedance (resistance) means “the lowest the impedance (resistance) will be at any frequency is not much lower than the spec listed.” This spec is unrelated to the quality of speaker performance but it can effect how much power your speaker draws from your receiver. The lower the impedance, the more power the speaker will draw from your receiver with the “volume” knob at a given position. • What is Efficiency (also known as SPL)? Cars measure their efficiency in miles per gallon, speakers in decibels (dB) per watt at one meter distance. If a speaker is 10dB higher in efficiency than another, it will play twice as loud with the same amount of power. An increase
