The high quality diaphragms used in PIYANO driver units are specially shaped, re-inforced phenolic diaphragm with precision voice coil with captain / paper bobbin for good heat dissipation. We have three models, one is self centered (golden) second one uncentered (Silver) and third one is self centered with aluminum voice coil (platinum). our diaphragms are known as best quality in P.A. industry, due to the wide frequency response and reliability
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