Amazon.com: 12V Low Pass Speaker Subwoofer Crossover for 8 Ohm or 4 Ohm : Electronics
Amazon.com: PRV AUDIO Low Pass Crossover 1DF180B Low-Pass Filter for Speaker and Subwoofer Crossover Point at 180 Hz with Unique Selectable Features : Electronics
How to Set the Phase and Crossover Frequency on Your Subwoofer
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