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These 18" passive radiators have a cast aluminum basket with a 1" (25mm) flat MDF disk, a cardboard former (to which you can add up to 400g of mass*), and a large half-roll surround which up to supports 3" peak to peak.
PR1821 Specifications - Bare
Fs: 3.65 HzQms: 67.72Vas: 1840LCms: 0.9Mms: 2100g
PR1821 Specifications - With 400 grams added weight
Fs: 3.3 HzQms: 74Vas: 1840LCms: 0.9Mms: 2500g
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APR Adjustable Passive RadiatorEach APR comes with 20x 45 gram discsAPR10Sd: 320cm2Qms: 7.0Cms: 0.48..
APR Adjustable Passive RadiatorEach APR comes with 20x 45 gram discsAPR10Sd: 800cm2Qms: 7.0Cms: 0.48..
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