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XT AUDIO XT-360XX 3-WAY CROSSOVER WITH REMOTE (CAR AUDIO) SOUND CAR | eBay
Amazon.com: Audiotek -CX2-300 Watts Maximum Power 2 Way 4 Ohm Car Audio Passive Crossover Networks/High and Low Frequency Response/Crossover- 3500 kHz (Pack of 2) : Electronics
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What is a speaker crossover? -- The Teufel Audio blog
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