Coronavirus: Key model now predicts 147,000+ deaths in the US
https://www.mercurynews.com/2020/05/12/coronavirus-key-model-now-predicts-147000-deaths-in-the-us/
take out the amp , pull out the wiring of the subwoofer speaker , plug a 2 wconnector wire into an external amp and test , if the speaker responds , your sub-amp is defective