Amazon.com: Foam Speaker Surround Repair Kit for JBL MR 25, J 520, J 520 M : Electronics
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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
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How to Repair Your Speaker - Replace the Foam Surround (Refoaming). - do-it-up.com
Speaker Foam Repair & Replacement from Start to Finish - YouTube