As can be seen from the power response curve, the drive to the room is totally even, reducing slowly with frequency. Comparing this with a classic modern 2-way which shows some of the uneven room drive. The crossover is 4th order acoustic Linkwitz-Riley with a time delay addition between LF and HF.
At the same time the impedance of Borg has not been compromised to gain false sensitivity. At 87dB at 1m for 2.83V and with relatively gentle phase angles, it is an easy load for an amplifier.