Back Horn Speaker V20 for Polymate3D Speaker Driver FD51  FD52 series
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Back Horn Speaker V2.0 for Polymate3D Speaker Driver FD51 / FD52 series

I remixed some parts of the Back Horn Speaker V20 to fit the Polymate3D speaker driver models ...

similar models —

Back Horn Speaker V2.0 for Polymate3D Speaker Driver FD51 / FD52 series alternatives
FD524OS Full Range Speaker Driver
Paul Ellis (Polymate3D)