i guess we can agree to disagree. The dd m4 does 3500x1 @12 volts with a 400amp fuse. the m3a is rated at 2050x1 @12 volts with a 250 amp fuse. im willing to bet you can get 2500 or more at 14 volts with that m3a. however this lanzar must be some sort of magical amp and the other vendors need to rework their boards considering lanzar has this amp that can do 4k on 250 amps. using logic will simply tell you that it is both mathematically and electronically impossible. even lanzar knows this and this is why the 4000d costs much more then 4001. I have seen the optidrive graveyard and its not pretty. he paid a good price for an amp that will do 2.5k to 3k just fine.