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Do we need a new standard for rating speaker impedance? One called musical impedance.
Maybe play a specified level of pink noise (more or less mimics frequency balance in music) through a speaker and see what the 20 khz band of power, voltage and current is to arrive at the effective musical impedance of a speaker. I'd bet most ESL's would get something like a 16 ohm rating this way. Some of those large ported box speakers will probably get a rating below 4 ohms.
Maybe play a specified level of pink noise (more or less mimics frequency balance in music) through a speaker and see what the 20 khz band of power, voltage and current is to arrive at the effective musical impedance of a speaker. I'd bet most ESL's would get something like a 16 ohm rating this way. Some of those large ported box speakers will probably get a rating below 4 ohms.