Speaker box

Ok heres the story... I was in this car audio store and this guy showed me this box that was crazy. He put a little 4 1/2 in. ford ranger door speaker in this box and it sount like a 12 or something. i was hitting crazy and sount real good. Does anyone know the box I am speaking of and if so possibly the deminsions or a website telling something about in. a box for 2 12s cost me 60 bucks and this guy wanted 150 for a single 12 box. Trust me it is brobally worth it. Thanks for the help

There is no way that a 4 1/2in door speaker sounded like a 12.

not possible. get your ears checked.