I was once in prison and made homemade speakers on the cell block for people... I used layers of hardback books to make the boxes and made my cones From drawing paper, used earth magnets and my coil wire I got out of the transformer in an alarm clock radio. I also built dual bridge rectifiers that I tied into the sound chip to double the power going to it. My voice coils were a total of 8 layers thick.. (4 coils)for one speaker... (2 coils for left channel and 2 for the right channel) but mono output.......... Not much to do in there so I spent my time learning .... Just sharing an experience......
