"r.berger" wrote in message
...
According to DIN standardisation the minimum impedance is 0.8 x nominal
impedance or the nominal impedance is 1.25 x the minimum impedance.
Consequently a speaker with a nominal impedance of 8 Ohm will have a
minimum
impedance not lower than 6.4 Ohm and a 4 Ohm speaker 3.2 Ohm. Thus a
speaker
with a minimum impedance of 4 Ohm has a nominal impedance of 1.25 x 4 Ohm
=
5 Ohm and could never be an 8 Ohm speaker (according to DIN).

Unfortunately I can't remember the last time I saw a speaker impedance
quoted according to DIN spec.
Maybe in Europe?

TonyP.