They used to rate them all at 12V flat (at least the D100 I used to have was, but that was 6 years ago). From what I've seen, the new ones are still rated at 12V.
Better double check that though, since just about every company rates their gear at 13.8-14.4V.
It doesn't say anything on the Mmats website?
diymobileaudio.com is the DIY car audio install forum for automotive quality and spl stereo bass. 12 volt audio installation wholesalers buy amps, subs, double din car audio head unit electronics and ipod blue tooth car alarms at discounted prices