it is very possible. however, they wont be getting all the power they need. just set the gain correctly and if its not loud enough, then you need a bigger amp. DO NOT abuse the gain/BB knobs
if you want to get the most out of those subs then yes you will need more power. however, i would not recommend getting 2 amps when 1 bigger amp would be less strain on current and wires. Also, when running more than 1000-1200rms, you will need upgraded electrical system (batts, HO alt, big 3)