This active 18″ sub is part of Electrovoice’s top of the range ETX series and is matched with the ETX15P and ETX35P. The sub is powered by a 1700W class-D power amp and produces frequencies from 32Hz to 150HZ at a max SPL of 135dB. It has a built in DSP system allowing for different EQ modes and crossover settings depending on when top speaker you have matched with.