There is no such thing as "True Biamping". Biamping is the simple act of using separate amplification for the high pass and low pass section of a loudspeaker. An active system puts the crossover in line level, before the amplifiers. The passive system has the crossover at speaker level, after the amplification. Both systems can provide more current, and better channel separation, but the active system exclusively provide lower phase distortion. The active system is the preferred systsem. Using the biamping feature of an AVR is worthless, because there is only one power supply.