well i have 2 kenwwod 1800 watt amps really 900 watt a piece if i wanted to just run one monster what would be my best option lev.5 or 4xl and i will be getting bigger amps soon

i run almost 2kw on just the Level 4 so i'd imagine if u keep it under 2500, level4 should be fine.

anything higher and under 4kw, i'd probably say the XL.

I run ridiculous amounts of power to my equipment but i also know to properly setup and monitor everything without worrying so if you do not know how to exactly, i'd run a XL if under 2500w and Level 5 for anything more.

I'm assuming that you have the KAC-9104D's. You would be very lucky to see any more than 700 watts with these. These are amps that were made to run at 4 ohms, and mae to sell by saying they can go at 2 and 1 ohm. Mine goes into protect at 4 ohms as it is.