Homebrew PCBs

In article <001b01c66954$bcd17210$6a00a8c0@xp2500>,
   Henrik Olsson <henrik-olsson@...> wrote:
> For example, take your average speaker, it will probably have a label on it 
> saying Impedance 4-8ohm but if you take your meter and measure the 
> resistance of the coil it will be near zero ohm.

Not really true, I think.

I was once told that, as a rough rule of thumb, if you need to estimate
the impedance of an unkown speaker, measure the DC resistance and multiply
by 1.4