The 9k's were fuckin beasts, and due to higher voltage stability, they would have higher potential then the 10k. That said, for those that are limited to 12v charging to maintain a classification for competing, then perhaps the 10k would be better. I think the low voltage thing veered off with DD because the amps are rated at 11.9v, and some at 12v where as the DC 10k is intended for a "12v system". And the m4a's are beast, ask Ray right above, he clamped a shade under 12k out of a pair strapped....all that said, fuck the bullshit ray, when are you going to put in 2 9s or 10s?