Amazon.com: Welugnal 4-Channel Car Stereo Audio Speak Delay Signal Hi-Low Converter for Auto Amp Subwoofer Amplifier CD Player High to Low Adapter Line Output Converter : Electronics
JL Audio ACP108LG-W3v3 Amplified MicroSub+ with single 8W3v3 (slot-ported) - Creative Audio
Dayton Audio APA1200DSP 1200 Watt Subwoofer Amplifier with Integrated Digital Signal Processing
What is the Subwoofer signal-out for? Could I connect it to a center-channel speaker? : r/audio