Who makes Brock-sonic televisions?

There is no known television brand called "Brock-sonic." It's possible you're misremembering the name or it's a very niche brand.

Can you provide any more details about the television?

* What does the logo look like?

* Where did you see it advertised?

* What kind of television is it (e.g., LCD, LED, OLED)?

With more information, I might be able to help you identify the brand.