How difficult would it be for someone be to get a hold of lots of metal wire in early medieval times?
It doesn't really matter what metal it is or how uniform, just that it's in long lengths (tens to hundreds of meters) and that it's reasonably fine gauge (<1mm diameter)
The character is trying to build a speaker (for shock and awe) and needs lots of (semi)affordable wire to build the speaker coil.
I've heard about wire-wrapped jewellery (presumably really expensive) and some forms of chainmail (only short lengths?) but I've not seen much about long continuous lengths of wire. Could it be done?