those speakers are a good choice but if u want 2 drive them you'll need more power.
the 929 is not bad but if u go kenwood consider getting 2 of them. drive each one of them mono at a 4ohm load. then you'll be bumpin
iowa boomer
lets say ur vega sub is 300watts. if u hooked up ur amp mono u prob blew the speaker, even though ur amp has small power rockford still under rates there amps.