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Best Choice RonDexy 
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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.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 endsPAC 
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