Complex sentence: The unit's frequency response was 53 Hz to 16 kHz ± 3 dB while the maximum peak sound pressure level was 116 dB at 1 m (using AC current) or 108 dB at 1 m (using DC current).
Split into simpler sentences: The unit's frequency response is 53 Hz to 16 kHz ± 3 dB. The maximum peak sound pressure level is 116 dB at 1 m (using AC current) or 108 dB at 1 m (using DC current).