The problem I was having with the HX2 was lots of dimming. I might just have a bad battery, it has died on me twice, but that was when I left it for months not going anywhere in the winter. I have also not checked my CAP to see if it is still charged. Ford had my car apart, and battery disconnected for a while.
I am also planning on getting a yellow top soon.
I have not yet really cranked up the system since installing the W6. Been trying to be easy on it for a while.
My guess is that I was stressing my amp when I had the HX2 just trying to power the beast and was causing excessive drain. The W6 seems a lot more responsive, and clearer with lot less power and louder to boot.
The amps is turned way down for now. I need to work on tuning the system again, but just have not had the time. Tuned it quickly by ear, one weekend I'll take a DMM or O-scope from work and play with it all.
Porting my box might be a little difficult, but I don't think I need it either. The W6 drops...its actually over powering my highs (tuning again..). If after a full tune, I'll have a better idea.