Really the only power rating that is relavent when talking about powered speakers is the MaxSPL number.  It really doesnt matter much whether it took a lot of Watts or a only a few ... the MaxSPL number is what the actual performance of the speaker can be.  You have to watch how this number is reported.  Sometimes it is "calculated" in which case it may appear 10-15 dB higher than if it were actually "measured".  The Line 6 spec is the more conservative "measured" method.

That said, the total continuous average power of the systems is a bit over 700 for the L3t/m's and 600 for the subs.  The continuous rating for power amps doesn't relate well to the sound quality properties of speaker systems and that's why you are seeing a large change across the boards from using them anymore.  The other thing it doesn't answer is how much power with the internal DSP processing allow to reach the speakers which in some brands can be as little as 50%. So even though tere may be 1000W of amplifier power available from the amps, the processing may only allow half of that power to actually arrive at the speaker. In the Line 6 speakers it is probably closer to 90%