The LD Systems Sub 88A Active Subwoofer features a Class AB amplifier that provides 150 watts of power (RMS) to the two 8 custom drivers. Complete with a rugged textured MDF cabinet the Sub 88A has a frequency range of 40 Hz - 120 Hz and a maximum SPL of 115 dB. The mono-amplification unit delivers incredible sound and dynamic characteristics a perfect partner for the SAT62 Active Installation Monitors resulting in accurate sound reproduction with deep and powerful bass.