The Luxman FL 153 is an active crossover produced between 1970 and 1972, designed to enhance the versatility of audio systems by effectively dividing audio signals into separate frequency bands for optimal sound quality. Constructed in Japan, this unit features a champagne color finish and was priced at approximately 650 DM at launch. The FL 153 operates as a multi-channel divider, capable of handling both two-channel and three-channel multi-amp systems while incorporating a mixing circuit for enhanced audio dimensioning. It employs an emitter-follower NF demultiplexing circuit with a cutoff characteristic of 12dB/oct. It can also switch to a more gentle 6dB/oct cutoff characteristic for different applications. One standout feature is the two-stage NF amplifier circuit, designed to provide a low-frequency gain of around 13dB, which is particularly beneficial for woofer units. The design incorporates measures to reduce output impedance and prevent noise interference in the high-frequency range. The FL 153 includes special mechanisms to prevent damage to horn-type speakers from excessive inputs during operation. The crossover points are adjustable, allowing frequencies to be set at 125, 250, 500, and 800 Hz for low to mid and from 1.5kHz to 7kHz for mid to high frequencies. Overall, the FL 153 offers a range of specifications catering to demand for high-quality sound management, with total harmonic distortion factors capped at 0.1%, adjustable gains, and low residual noise levels.
