need to ask
 

what is the true power of this
http://vancouver.en.craigslist.ca/rds/ele/2159733448.html

The amp has two 35 amp fuses on board.

Quick math puts that at about 700% efficiency then :)

have you done your homework dude? a google of max pro mxa 282 gets you to the spec page from Lanzar! 2x 1000 watts rms at 4ohms.. however if that where continuous 100% efficient you would have to draw 144 amps from 13.8 volts! So obviously the specs are highly over ambitious.