Not to discourage you from experimenting either, but my recommendation would
be to wire two 8 ohm speakers in parallel and connect them across the output
of your amp. This would allow you to reach your amp's full output and also
increase your volume ouput. Of course if you don't have a second speaker
then my advice is useless :s


"elfa" wrote in message
...
I'm connecting a small 3" 8 ohm speaker to a low power, battery operated
amplifier that was originally connected to a 4 ohm speaker. I want to
match the
impedances by making my own small audio transformer using just a torroid
ring
and some very thin wire from an old AC transformer.

Question...

What are the mechanics involved. I know I'll need two windings, a primary
and
then a secondary. Can I just wind some of the wire on one side of the
torroid
as the primary and then wind 2 times as much (because of 2 times the ohm
value)
around the other half of the torroid?

Is there a minimum number of winds or is it a case of the more winds the
better?

I'm trying to keep this bedrock simple.

Any advice will be appreciated.

thanks

elfa