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That was a terribly flawed demo on the effectiveness of the wire wrap to silence riser vibration.
The first riser makes full contact with the surface, the wire-wrapped riser did not, it was partially cushioned by the wire wrap itself. A far better test would have been to suspend the riser and strike it with a hammer, like a tuning fork. Then if there were any vibration dampening, it would clearly and indisputably be because of the wire wrap. For any dampening material to be effective it has to be in good contact/transfer with the vibration wave, which is not evident in the wire wrap installation. As far as testing a Mathews riser, it should be done with the HD/HS installed. Personally, because the wire wrapped riser also had a ringing sound, although less pronounced, I consider whatever dampening there was to be less than fully effective.
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