I have a 900 watt RMS RF amp and want to get 2 better subs got them all picked out just don't know if i can hook up a 900 watt and and a 300 watt amp too a pair of subs i just need the extra 300 because the RMS on the new subs is 600 i want to use the 900 and 300 as one amp for the two sub if anyone understands this i need help