I witnessed a DD M4a putting out a little over 4k @ 2ohm with a voltage drop down to 11.7 & vehicle off. The vehicle was a Jeep Cherokee with 6 Stinger SPV70's in the rear with I believe 2 runs of 1/0 power. It replaced a Sundown SAZ3500D that had been ran down to .25ohm & produced magic db smoke. Not trying to sway you one way or the other, just stating what I saw. I've ran JL, Sundown & DD with good results from each when supplied with the correct electrical.