Speaker-level inputs or line output converter (LOC)?
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Amazon.com: DS18 EQX7PRO Audio Equalizer/Crossover High Level Input 7-Band Auto Turn On, Subwoofer Output, Adjustable Filters, High Volt Led Indicator, RCA Input - Great for Finely Adjusting Amplifiers Ranges : Electronics
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High-Level V.S. Low-Level Inputs - Sonic Electronix Learning Center and Blog
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10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built In Amp, Powered Car Subwoofer w/ Low & High Level Inputs - Pyle PLBX10A - Walmart.com
S10 | NEXT Audiogroup
High-Level Subwoofer Amplifier Input Cable (one cable) - Anchor Chain Shop— BLUMENSTEIN AUDIO
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Tips and Tricks for Connecting a Subwoofer to Your Receiver
