One SA-8v2 DVC2 Shaking

One SA-8v2 DVC2 wired 4ohms load Box Spec ft’ tuned 35hz 2008 Honda Pilot SUV Stock HUD Alpine MRV-T420 340RMS@4ohms Big Three, 4ga wiring kit. Under power this subwoofer but still shakes a bit, it would probably take twice the power I’m pushing now all day long...