I have replaced the diaphragms in a pair of Altec 807-8A drivers myself, and it was a piece of cake. I'm sure there are people on this forum with a lot more experience (and probably more tips)than I have, but one tip I was given by Altec Professional when I bought the new phrams from them (before GPA existed), is when you're inserting the new diaphragm, do not twist it at all--push it straight in--they are fragile. You may need a conversion kit as well..... Be sure to buy the replacements from GPA--that's currently the only place I buy Altec replacement parts or have Altec repair work done. They reconed an Altec woofer for me last year and it came back a brand new woofer. I try to support them whenever I can--I'm tempted to buy spare diaphragms for all three pair of Altecs that I currently own plus some recone kits as well in case I need them some day when GPA isn't around.....
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