Got mine from The Speaker Exchange last week and have fitted it in. Works perfectly so far, touch wood.
Sold out and now on backorder until September or October. There seemed to have been a lot sold in the past few weeks. Looks like all the amps were going bad in close proximity to each other. I purchased my Klipsch Subwoofer in 2017. Three years is not long for a product that cost me within a region of £500-£600.