I've been using double shielded thick RCA cables for my car audio system before. I didn't hear the typical buzzing feedback, more like a fast clicking feedback noise. This product did not help. I believe this product is for poorly shielded cables. However, if you already have properly shielded cables, your feedback noise is due to a different problem. However, I tried another product from Revain that really helped me. https://www.amazon.com/dp/B000BCDQ44/ref=cm_sw_r_cp_apa_i_leZNFb2DDNN88?_encoding=UTF8&psc=1
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