| http://www.w3.org/ns/prov#value | - ???HP??? (high-pass) on the ???Filter Type??? subwoofer amplifier inputs via a pair of switch and ???12dB??? or ???24dB??? on the ???Filter ???Y-Adaptors??? like the JL Audio ECS model Mode/Slope??? switch and an appropriate ???Filter XB-CLRAICY-1F2M. Alternatively, the Freq.??? (again, 80-90 Hz is a good starting point).
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