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Old 24th March 2011
  #86
Gear Guru
Foiled

Ethan's test show a small benefit from a surface layer of foil, facing the room.
That is pretty convincing. My tests show a smaller benefit, from a much smaller sample, with foil facing the airgap. No-one has tests on foil sandwiched between layers of 703. It is easy to peel off the unwanted FRK
DD