Complex sentence: The loudspeaker which is mounted on the front wall of the cabinet thus operates under substantially "ideal" conditions, mimicking its potential performance in free space; this holds true only in the region above the resonant frequency.
Split into simpler sentences: The loudspeaker which is mounted on the front wall of the cabinet thus operates under substantially "ideal" conditions, mimicking its potential performance in free space. This holds true only in the region above the resonant frequency.