The Quack of the piezzo of the fishman is still there and this unit does little to attenuate it.I know they get good reviews but that's my personal experience. Fret rattle and the most horrible piezo quack so much so I run it through an acoustic modeller.Quack, Tobias Michael Heßeler, Frank-Josef Abel, Dirk Cooperative Localization of a Networked Multi-Vehicle System In: IFAC-PapersOnLine, 52 (8), 428-433, 2019 Lin, Jiaying Lou, Zhiyuan Zweigel, René Abel, Dirk.It has a velocity in air at sea level at 0☌ of 331 metres per second (741 miles per hour) and travels as longitudinal waves. a periodic disturbance in the pressure or density of a fluid or in the elastic strain of a solid, produced by a vibrating object.

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