Hi all! I'm wondering if any of you have an opinion about which of the different room calibration tools that the suppliers include in their receivers is the best. Have anyone tried different versions of these in their own living room or in a demo room? I'm mostly interested to know the difference between the following: YPAO - Yamaha's room calibration which is supposedly in the third generation, 10 bands EQ. Can be found in RX4600, RX1600, RX2600 among others MCACC - Pioneer's room calibration, 9 bands EQ. Can be found in AX4AVi, AX2AV and others MRAC - Marantz room calibration that you can find in SR9600, SR8500, SR7500 Audyssey MultEQ XT - Denon's room calibration which does configurations for up to eight different positions in the room. Can be found in A11XV, 3806, 4306 Any comments or opinions on any of these, or even comparisons?