Looking at this old thread. it appears one of the answers would not be correct for the Elite version of the Beethovens. The elite version had a 4 way active crossover for each channel. The standard Beethovens had a 2 way active crossover with a passive crossover in the box attached to the panels. The elite requires 8 channels of amplification (4 for right and 4 for left). The Elite active crossover is also XLR balanced only connections. The elite has no passive crossovers for the panels.
Very, very nice speakers and one of Sigfried Linkwitz's finest designs!