well i have a poweracoustik 5500, and it does 1700 at 4ohm, and i've been running my kicker CVR 15"s on it. there aboiut the same RMS rating as the obsidian. i just didnt know if they could take the 600 RMS rating they have on the site. or possibly take more than the 600. i'm kinda new to this stuff so i dont know a whole lot