So there's no way to turn off the speaker's internal amp for the sub and use a jumper between the speaker's binding posts?
Then I suppose you could set the fronts to LFE+Main and set the surround rear channels on the receiver to bi-amp. Then the main speaker terminal could go to the regular speaker posts and the surround rear channels that are sending a bi-amped signal could go to the built-in sub's speaker level inputs. From your sig, it looks like you have a 5 channel system, so you should be able to configure it that way.
The only other way I can think of would be to divide the LFE RCA cable three ways.
I'm just throwing out suggestion here because it's pretty hard to find any info on these speakers to see exactly how they're set up. But I'm sure you already know that.
The amp, on towers, do have a switch. It can power on auto w/ sound signal or stay off. They are set to come on with sound. They can bridge w/ main speaker terminals. This way, the whole speaker, w/ amped wolfer, work as one speaker.
My question simply put was this. Would these pwd subs, in my front towers, sound better playing lfe channel to give me the equivilance of 3 subs. Or would my surround system have better sound having these as left and right full range speaker including sub-bass freqencies.
I think I have decided to keep them as just left and right speakers because I forgot that I listen to music in stereo and I don't want to lose the base in this mode.