OK, I have a 2002 Ashdown EVO 500 on the way....It is 4 ohm I already have a Ashdown 410T rated 450 watts at 8 ohms. I was thinking maybe I should pick up a Ashdown Rootmaster 410 T that is specked at 450 watts @ 8 ohms and use both cabs with the 500 watt 4 ohm head. A sales guy at Sweetwater told me that I don't want to do that unless I get a more powerful amplifier. That I need to just use one 410 @ 8 ohm cabinet. I am confused.... Help please.