I have two R-115SW subs, bought two years apart at Crutchfield. The amp on the one bought in 2016 failed November 2021, well after warranty coverage. I was shopping speakers at a Klipsch dealer (Gramophone in Maryland) and asked if they could get the replacement amp (the one from the SPL-150 is the recommended substitute) and the cost. Gramophone's Klipsch rep sent me one for free and I popped it in. It works fine.