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Used in a system with the XC-3, the LF-3 performs the low frequency crossover functions in a 3-way system as shown at left. Unlike the XC-3, though, it is a device with two discrete channels; one LF-3 with an amplifier will support two other amplifiers with two XC-3 accessories, as shown. The 4th-order Linkwitz-Riley low-pass filters have 24 dB/octave slopes.
Each channel also has an all-pass filter providing delay for time alignment. Frequency and delay parameters for both channels are set individually, although in all but a few applications they would be set the same.
Each channel also has a trim control providing 0 to 20 dB of attenuation to facilitate matching levels among the various frequency bands.
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