__High power passive sub bass speaker__ - 6” long excursion woofer - Variable vertical coverage - Wide range frequency response - Double 6” passive radiator - Double voice coil (4 Ohm + 4 Ohm) - Electronically protected - Weather resistant, suitable for outdoor installations- IP54 With a frequency range of 45Hz to 300Hz, KU36 is the perfect companion to any of the K-array Installation Series speakers, like KZ12 or KV50. The combination provides full range frequency response with prodigious output and a virtually invisible profile.