Complex sentence: Speaker designer Brian Cheney viewed high-order filters as undesirable because they were not "minimum phase", meaning their phase response was not flat with frequency and also often required drivers be wired electrically out-of-phase leading to inferior stereo imaging.
Split into simpler sentences: Speaker designer Brian Cheney viewed high-order filters as undesirable since they were not "minimum phase", meaning their phase response was not flat with frequency. He also avoided high-order filters because they often required drivers be wired electrically out-of-phase and had inferior stereo imaging.