cause they're so loud . The v4 has a loud and punchy characteristic anyway the 120's would take it further. four of em would produce a mighty mighty boss tone . the 120's will produce a "rifle shot" like crack that very few , if any , speakers could match.
the original smoke was loud and punchy , not so marshally although it was a marshall.
that combo will get crazy loud like 130 or so it'll make you punch drunk but you'll love it.