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Best Choice RonDexy 
RonDexy RDBB-150 Pair of Bass Blocker/Passive Crossover Protect car Audio 8-12inch Speaker Filters Out 0-150Hz (4 Ohms) Capable of handling up to 50 watts of power.RonDexy 
RonDexy RDBB Pair of Bass Blocker/Passive Crossover (Protect 6''-6.75'' Speaker) 1.Shields 6.5” car audio speakers from harmful frequencies.Best Value RonDexy 
RonDexy RDBB Pair of Bass Blocker/Passive Crossover (Protect Tweeter) 1. Shields car audio tweeters from harmful frequencies. Two 5600Hz bass blockers (attached 6" speaker wires on both endsAudiopipe 
AUDIOPIPE 14 UF BASS Noise BLOCKERS 2.8khz @ 4 Ohm 3.5 to 4 2 PCS Brand New & Factory Original!YOUYIEN 
6.5 Speaker Foam Fast Rings (4pcs) - Fits 6" & 6.5" Door Speakers, Bass Blocker Soundproof Sponge Kit Product Function: The car speaker foam ring prevent the sound quality from spreading, Absorbs the echo from the car doorNippon 
Nippon Bass Blocker pair packed NIPPON BASS BLOCKER PAIR PACKEDYTJHOME 
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