Is it customary to set low-pass to a sub at -3 dB or - 6 dB of a speaker response curve, e.g., 80 Hz or 45 Hz for a KEF LS50? What about high-pass in relation to low-pass?
100-120 is the max unless you want to mess up the stereo image, Very very few systems utilize low frequency EQ and owners w tools to measure in room bass at the listening position. Some of us are blessed.
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