This GMC Envoy was built with one thing in mind, make it as loud as possible! Two Orion HCCA 12.2 subwoofers are mounted upside down in a large 9 cu.ft. vented enclosure tuned around 40Hz to make it pound even harder! Each sub is powered with a single Orion HCCA-D5000 which generates a total of 2500 Watts RMS!! A Kinetik HC2400 battery maintains the voltage level for extended listening. Recently hit a 155.4 dB at a soundoff held by American TV!!!