Audiophilepure

https://www.soundstageultra.com/index.php/equipment-menu/914-pmc-fact-fenestria-loudspeakers

Each bass cabinet is finished in matte black to complement a 15mm-thick, secondary front baffle machined from a single piece of acrylic composite. This secondary baffle is “floated” over the primary baffle with an array of magnets, and isolated from the cabinet with a foam gasket. Between the primary and secondary baffles of each bass subenclosure are sandwiched two 6.5” woofers, each rigidly bolted to the main cabinet. These four woofers per speaker — PMC calls them piston drivers — are unique to the Fenestria, and were several years in development. Each cone is a diaphragm comprising two skins of triple transverse-weave carbon fiber sandwiching a core of multicellular Rohacell foam. The mass of these skins has been reduced using a special manufacturing technique that limits the diaphragms’ absorption of adhesive and lacquer, and the cones are driven by a motor assembly that includes two beefy ferrite magnets each 5.5” in diameter, 3.15” thick, and weighing 5.5 pounds.”

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