Subwoofer & AV Receiver Crossover Settings
This is a good starting point and, honestly, should be more than enough for most home theatre systems. Steps: Subwoofer settings: Crossover at maximum point. Mostly this is 150dB or a marking that says LFE (disable). Phase at 0 degree. Gain at 11 or 12 o'clock. AV Receiver: MultEQ or equalizer settings at OFF. Again, OFF not flat or some mumbo jumbo setting. AV Receiver: Subwoofer level at 3dB. Make sure distance setting (eg 3m, 4.2m) is correct. This distance is between your sitting position and subwoofer location. AV Receiver: Subwoofer/LFE crossover setting at 120Hz. AV Receiver: Rest of the speakers set to SMALL. Crossover settings: Front speakers 90Hz, Centre speaker 120Hz, and surround speakers at 150Hz. That's it, you're good to go.