Hi, I'm using an active mackie srs1500 as a sub under my eden 4x10 xlt. I can run this in two configurations. i have an eden 800 wt and a 1973 100watt fender bassman. The mackie takes everything below 120 hz, so using the eden I can run direct out of the eden into the woofer and then using biamp mode on the eden send everything above that to the 4 x 10 xlt. or .... using the fender via di box I can go direct to the woofer..using the internal crossover send everything below 120 hz there and also go fullrange through the 4x10. I have to say at this early stage I prefer the sound using the fender head. I'm still in experimental mode at the moment, but I have to say it moves some serious air, and to my ears at least sounds ok. Its received good reviews from the members of the three bands I'm in at present, and I was wondering is anyone else doing something similar, no one seems to be doing it here. cheers smack.