I just setup the Harman Kardon avr520 receiver and the pa2000 amp. I am planning on running the 2 front speakers from the pa2000 (using the preamp outs) and the 2 rears, and center from the avr520. However, I have read about setups where people use the pa2000 for the rears and the avr520 for the fronts. Which is the preferred way? I would appreciate a good explanation. Thanks.