Originally posted by VRGNCD5
Really? :hmm: I looked at their site, and as huge as thier subs are(the ones in the link above) you'd think they'd be able to handle more than 400watts rms:dunno: But the idea of the impedance cartridges is very 
The 400watt rating isn't bad for a sub, it's actually plenty. i have 2 12" PPI C1s wired to 2ohms sharing 300 watts and it's actually plenty of thump. If i wired them for what they are rated for max continous rms, it'd be extremely loud.
look at all the amps on the market too. a radio shack amp is rated higher for what it can put out (with the sound still being clean) whereas your high end equipment is usually under rated power wise and your sound is still extremely clean. so you might be able to hook up a 1000watt Optimus amp and your sub won't get blown out, whereas a 250watt PPI amp would be pushing that sub to the limit. my guess is when they rate speakers, they take a middle of the road (quality wise) amp and rate it for that. that way it's rated for pretty much anyone that's going to use it. but that's just a guess, if anyone knows for sure, hell, i'd love to know!