I suggest the following test.
Take one of each headset. Hold one by the cord about a metre from the connection to the headset. Twirl it around your head as fast as possible. Now release it in the direction of a brick wall at a distance of two metres. Repeat with the other headset. After the test, return any non-functioning headset to the manufacturer.
Unrealistic test? Perhaps, but that fact seems to be lost on the David Clark Company, who seem to make headsets that survive it -- thank God.
[Bookworm takes no responsibility for losses suffered by anyone dumb enough to actually ...
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