FYI, your HU puts out about 20x4 RMS. That 50x4 is a peak measurement which is for the most part a useless marketing gimmick.

I wouldn't use the 4x6 plates if you plan on a system without a dedicated sub.

1999 SVT #900/2760
Born on 1-20-99
Silver Frost/Midnight Blue
A few aesthetic and audio mods