What can I replace 6 micron tensilised Mylar with?
The short answer – 12 micron Mylar. It is nearly as good, and produces a little detectable sonic degradation in the treble panels, but you must get it to a higher tension to make the diaphragm resonance supersonic. See Hard Core, for the formula that shows a relationship between diaphragm tension, diaphragm mass and resonant frequency. Alternatively, SKC in the U.S. make a 7.5 micron and even a 4.5 micron tensilised polyester film, if you would like to buy 8 ton (I asked) minimum of the stuff!. Also, you could try 6 micron Hostaphan (very promising), sold in the U.K. by GoodFellow, see the Parts section of this site for details. Also, I am offering 6 micron Hostaphan® on this site too, for a lot less money than Goodfellow do!
