Lucky accident

[playmysong 2]

I know someone that doesn't know much about audio and box tuning and such but managed to build a pretty good sub system. He had 2 10's and built the box like this, his words, " I built a box, drilled a hole, and stuck the pipe in." It was a flared aero port 3 or 4 inches diameter, not sure. It was in a chevy tahoe and sounded good and got pretty loud too that lucky sob. Does anyone else know someone who got lucky?