I bought this sub without listening to it solely based on the great reviews it has on the internet and because I trust Klipsch since I have all their other 5.1 speakers and they are amazing! I decided to get the sub last and upgrade from 5.0 to 5.1. I was disappointed as soon as I connected it to the point where I called the store I bought it from to return it the next day. After they told me I couldn't return it, I called various sellers and they were all surprised. With many tests on the Hz and volume, I almost got it to where I wanted it. Here are my conclusions:
The bass is weak in volume even though it's a 12-inch sub. If you set it to 80Hz, which is where I have it, and increase the volume, you don't hear it loud enough, especially for me who has many big speakers.
Increasing the volume, the sound becomes distorted and makes a buzzing and sustained noise. It doesn't have that dry and sharp sound that I would like in the bass, it makes a bothersome buzzing sound.
In movies, there is no problem, it plays just fine.
It has a quality and sturdy construction, but I wouldn't buy it again