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Old 16th December 2012
  #22
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Regarding the difference between polyester (Mylar®, PE) and PVC membranes in M7-size and style capsules:

To a trained ear, they do sound remarkably different, and should be auditioned by a potential buyer before a decision is made.

Additionally: current-generation PVC membranes should not be compared sonically to PVC material from a decade ago: Germany outlawed the previous PVC formulae, for environmental and health reasons (harmful during manufacturing, not after curing). Different formulae set up and dry differently and the differences in molecular structure of the materials (my guess) also change the membane's dynamic behavior.

Healthy PVC M7 capsules are not per se brighter than Mylar K47 models, though they differ in response in other ways: K47 are softer, less aggressive in the mids. However, with aging, PVC dries up, and, as the capsule's low end goes, one is left with the impression of increased brightness.