Neo, the standard bass management in HT receivers rolls off the sub above the selected crossover frequency at 24 dB/octave and rolls off the speakers below the selected crossover frequency at 12 dB/octave.

If explosions and other very low frequency material sound better on the mains than the sub it means that the sub isn't a good one. They're specifically designed to excel in those frequencies; that's the whole idea behind a sub and bass management.

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Enjoy the music, not the equipment.