BiAmp systems are either:
2-Way speakers designed to have both system components (High Frequency/Low Frequency sections) individually powered by two separate amplifier channels. This configuration allows for both input level adjustment and the application of precise electronic crossover frequencies and time alignment for all system components on an individual basis.
OR
4-Way OR 3-Way systems equipped with a Klipsch Passive Processor that allows the four system components (High Frequency/Mid Frequency/Mid Bass and Low Frequency sections) OR three system components (High Frequency/Mid Frequency and Low Frequency sections) to be powered by two separate amplifier channels. This system type still allows some flexibility to set input levels and electronic crossover frequencies with a less complicated setup requiring two (versus three or four) wire runs due to a reduced number of amplifiers being used