The d&b Ci7-SUB SC is the installation variant of the C7-SUB, engineered as a bass-reflex subwoofer with a single 18-inch driver. This passive subwoofer delivers maximum SPL of 135 dB with a frequency response of 44 Hz to 100 Hz. Constructed from marine plywood with impact-resistant finish, it features a protective metal grill with acoustically transparent foam. The cabinet includes four M16 threaded inserts for secure installation mounting and a single NL4 connector. Measuring 74.0 x 58.0 x 62.0 cm and weighing 45 kg, it offers 400W RMS power handling for professional audio installations requiring high sound pressure levels with minimal power compression.