#### samcheetah

##### New Member

from what i know XL=2*PI*f*L

so the impedance of a certain inductance(in this case a speaker) would be at a specific frequency. so if i would say that this speaker has an inductance of 16 ohms i would have to say that it is at X frequency. but speakers operate at thousands of different frequencies because the sound is constantly of varying frequencies. so how can someone say that this speaker has an impedance of X ohms when the frequency is not constant.

for transformers used in power supplies one can specify the impedance because it is at a fixed frequency (50 or 60 Hz) but for audio transformers and speakers it shouldnt be like that.

plz can somebody clear my confusion. any help will be appreciated