This is the one I was referring to:

https://youtu.be/r8D3c4_4ERQ

Some other treats for you:

https://youtu.be/4Y2gK4n35hw

https://youtu.be/tXLoP9iSU5Y

You can destroy your Patadigm sub with this so you can have an excuse to get a real one:

https://youtu.be/w2S-A3Cw3sw

YouTube, dude. I cancelled all other entertainment services.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated