I have owned a dozen DefTech speakers from powered towers to the original BP20 super tower. While I enjoyed the sound, I suffered so many amp issues that I dropped them all. I’m using RBH Reference In my main room with a massive Pioneer VSX-59txi driving them. There is no comparison. My SuperCube III is a great sounding sub, but doesn’t come anywhere near the published 16 Hz. It’s more like 32Hz. My BP20 has a published low of 18 Hz, but it’s lucky to hit 40hz with any authority. They fudge their numbers big time.
Now my reference RBH sub, it’s published low is 18 Hz, yet I have tested it at 10hz.