MOTM

I don't mind helping out fellow MOTMers at all.
I run my Genelecs full-range.  I run a seperate volume control on my 
console to the Sunfire with the crossover set at about 80 or 90 Hz.  
I have the Sunfire calibrated with the Genelecs so if I set the two 
volume controls at the same position the levels are matched.  I keep 
the Sunfire underneath my console, some of my clients never even 
realize its there.  
There are absolutely no phasing problems and no loss of imaging 
whatsoever.  I cannot often even tell whether the sound is coming 
from the Sunfire or the Genelecs once I get into the range of the 
crossover frequency.  
The biggest drawback is that if the sub is up too high, which is 
what my clients seem to want because they like the low end, then the 
bottom tends to end up to low in the mix.  This is why I like to 
keep the sub level matched to the Genelecs, and always check the mix 
without the sub as well.
The Sunfire is made by Bob Carver.  It can deliver 2700 Watts on 
peaks due to the energy storing characteristics of the built in 
power amps supply.
I'm sure I've never heard it anywhere near that!  I value my hearing.