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80Hz is a safe and common recommendation. Going higher often results in the location of the sub being all too noticeable.

Another approach is to choose a frequency about 20Hz higher than the rated -3dB point for the main speaker. Thus, if the -3dB point is 40Hz, use 60Hz.

All that said, the best way is to measure the speaker performance in situ since room and positioning will greatly affect LF extension and smoothness. With such measurements, you can choose the best frequency for your system in your room.

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