Foam or rubber surrounds? Change foam for rubber surrounds? - YouTube
GHXAMP Speaker Foam Repair 1 2.5 3.5 4 6.5 INCH Suspension Surround Folding Ring Full Range Woofer Speaker Replacement 2PCS - AliExpress
Amazon.com: Springfield Speaker 6.5" Foam Surround Repair Kit - 2 Speaker Kit - Compatible with Several Dozen Commonly Used 6.5" Speakers of Different Brands and Models Whose Foams Match The Measurements : Electronics