The 4675C-4LF (4 Os) and 4675C-8LF (8 Os) are designed for biamplified applications, where an external electronic crossover or cinema processor is used in conjunction with separate amplifiers for the high and low frequency sections. Powerful low frequency sound is delivered by two 2226J VGC low frequency loudspeakers, providing maximum peak output capability. The 4675C-8LF is approved by Lucasfilm, Ltd. for THX system installations.