Review on Clip-on Noise Filter, VSKEY [10pcs 9.0mm] High-Frequency Ferrite Core Choke Cable Clip for Subwoofer, Speaker, Mixer, Home Audio Device - Effective Noise Suppressor (0.35 inch Inner Diameter) by Paul Williams

I've used double shielded thick RCA cables for my car radio before. I didn't hear the typical humming feedback, but more of 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 sound 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