Just got tis QSC power amp to go with my SWR Grand Prix Pre. I intend running it in stereo so that I'm putting 700w into my 610. The SWR manual states- "For a power amp to be compatible with the Grand Prix while using the unbalanced out jacks, its sensitivity must be 7V RMS or LESS and have an input impedance of greater than 600 ohms." Will the 2402 be driven hard enough by the Grand Prix? Is it best to run the 2402 with the attenuator fully up and control from the pre?