First time ESL project... I am going small for a first effort; headphones. I need some recommendations regarding easy to find (local) sources of small amounts of 1/2 mil mylar--novelty helium balloons? I would prefer clear material. What distance from the outer ear to the diaphram has been shown to work for full range and safe operation? Maybe a Stax owner might provide this dimension as a starting point?
...j
...j