Bests & Worsts Reviews from Amazon

I want to make it clear that I been wanting a Klipsch sub for a long time. I resisted buying a cheaper lesser brand for months. My expectations were prepared to be disappointed as everything in 2020 has been. And for 1 day I was over the moon happy with this product. It was the very next morning that I could hear a low hum from the sub. At first I thought I forgot to put in Auto power on mode. It was in auto. I moved the switch to On, no change same hum. Off position no hum. So I ordered a major over kill of a RCA cable thinking I may have damaged the old one during the install somehow. I removed the old rca from the sub and the hum stopped. I removed the other end from my receiver thinking it may be loopback ground issue between the 2 devices. I then plugged in the sub side back in. The hum was instant and even louder. From what I am seeing on Klipsch's forum and many others is the same issue. It's not a defect it's working exactly as intended! What the actual F*#@!!!! This sub's Amp design is garbage. The problem is the subs 2 (3rd is ground) prong power cord which means the Amps power section is using a floating ground. When you connect your RCA cable the sub will make a low 60ish hz Hum. This is even before its even connected to your receiver (so not a loopback ground issue with anything but itself). Took a lot of forum hunting to understand the issue. No magic RCA cable is going to fix this. I have tried several high end cables and they made zero difference. Odds are like me you will not notice right away. As you will be busy making it hum on purpose playing movies and music. It's later when it should be in sleep mode you will hear the hum. Same cables different amp with 3 prong power cable no hum. If you don't mind the constant hum the sub will do its job and make loads of bass. Above 80hz the enclosure will resonate a bit, but from a few feet away it's not that noticeable.