Actually I was rewinding the voice coil. (I've done this succesfully before,
but not with this tweeter). It seems that the enamelled copper wire that was
used was not standard enamelled copper wire as the total length of the dual
layer coil was about 2.84metres which in 40SWG gives a dc resistance of
about 3.7ohms. However the original which appears to be the same gauge
measures about 7ohms. So that is that, unfortunately, as far as I can see.
:-(