6 zv4 15s 4th vs 6th help

[99windyhoe]

Build details : 99 Tahoe 

6 zv4 15s D1 mega roll cones

2 taramps md 12k’s @ .67 ohms

dual 270 alts / 135ah cmax

full fiber glass cab, box sealed to cab with fiber glass,  stripper pole ect ect

I’m torn between a 6th and a 4th order wall with this one. I’m told the zv4 do well in a 4th but really wanted to do a 6th tuned to 25/50hz with 4 6” aero ports in the rear and square port up front 

The plan is loud and windy however my concern is that I’m estimating to clamp 20k  or more out of the amps is my general guess (which could be wrong) and throwing that much power at the subs in a 6th will have them slappin like hell. I plan to under size the bottom chamber to 3.5 cubes per sub to compensate for the power, 2:1 ratio 

basically I’m here to see what everyone thinks and open to think that maybe someone will give valid reason to do a 4th not a 6th (reason I want a 6th is for the lows and wind)

[CstrokerV]

So they  fixed  not liking running below the rated ohms or was that just their first gen stuff 

[99windyhoe]

If your referring to the amps 

They have a new board on them 

still not rated for less than 1 ohm but people play them daily at .4 anyways