Parts Express - Tang Band's T1-2025SC speaker module features a passive radiator-assisted 1" aluminum composite cone full-range that plays from 95 to 20,000 Hz in a tiny 1.65" diameter package. Compact Speakers /
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Amazon.com: Cuifati Woofer Diaphragm,DIY Woofer Diaphragm Subwoofer Passive Radiator Booster Speaker Replacement Kit Diaphragm : Electronics
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