An 8 ohm woofer is less "aggressive" than a 4 or 2 ohm sub. That doesnt necessarily mean it wont be as loud,but generally speaking the bass will be less boomy.(more accurate)
Most home theater speakers are 8 ohm,because in your home you can direct the speakers to your listening position,but not so in the car, thats why most car speakers are 4 and 2 ohm.
You should always look at RMS,Peak power is just the MOST power a speaker can take,like in a really deep bass note for example.
Speakers are more often blown by overpowering than underpowering, so make sure u always give ur speaks some extra room to breath.
600w RMS is a lot though....so you should be good with those subs,If u match em with a proper amp they will rock your socks off
