Klipsch R-112SW Subwoofer *not working*

For Sale is my Klipsch R-112SW that sadly, has just stopped working. It still has power, green led is on as normal. I dont know why it has stopped working all a sudden. It will ofcourse be fixable but I'm just not willing to play around with it. Its such a great sub so hopefully someone will grab it and get it fixed. I attached a receipt which shows I paid $1100 for it in December 2018. Physical condition is excellent