VIBE OPTISOUND 8 AUTO SLIM PASSIVE UNDERSEAT SUBWOOFER | eBay
One of my subs not working at all. : r/subwoofer
Trying to fit subwoofer in car but no power getting to sub. Voltage reader not picking up anything but all in car electrics work : r/electrical
The Five Cs of Subwoofer Setup | Wirecutter
Subwoofer not putting out much sound after new headunit. It worked on my last one. Put in an Atoto A6PF, it had only one sub out so I used a RCA splitter.
Subwoofer not working - Loud sound when volume raised : r/audio
Tuning your subs
Subwoofer is not performing as it should : r/CarAV
How to troubleshoot no sound coming from an active subwoofer. | Sony USA
Spl Subwoofer 1000watts Max Power Speaker Auto Electronics Horn Dual 4ohms Car Audio - China Dual Voice Coil Car Subwoofer, 91dB Car Subwoofer | Made-in-China.com