Its a waste of 4k, if you ask me, these chinese un-branded amps are worthless, always go for a famous/known brand when buying electronics.
im sure the rockmars amp would read 2000 or 2800 watts, but its all BS, these unbranded chinese amps, not just rockmars even Caliber amps would read 3200 or so watts, but in true RMS they wont even give you 200rms max, fake ratings just for advertising purpose.
think for yourself a 4k amp reading 2800watts tops and a 12k kenwood amp reading 720watts tops, obviously its a publicity stunt by the " Rockers ", how do you expect in a price which is 3 times lesser than that of the kenwood youre getting 4 times more power than a m845 lol. its all fake:)