i have a pair of soundlabs blue cab 600w each, 250 rms over 8 ohms, im looking for an amp that'll get the best out of these speaker and im not sure what to get as this ohms buisiness sways me out. iv found a soundlab amp that gives me 250rms over 4 ohms, not sure wat the ohms means but i guess i need an amp that does that for 8 ohms, wat do ohms do and wats the diff between 250 over 4 and 250 rms over 8, thnx