[ok_dad]

LFE is usually a bass shaker which is a subwoofer but it moves a weight instead of a cone, so you get vibrations in your seat. It stimulates movement to your body somewhat, I use two for my sim racing rig, one under my seat to inform me of the car dynamics and immersive feeling, one under my pedals to inform me when ABS is active and when my tires are spinning.

[samplatt]

LFE can mean "bass shaker", but it's an industry-standard term invented by Dolby that effectively means "between 3 and 120hz", which usually means "subwoofer".

These days crossover points are very configurable. Most bass shakers are rated for use between 20hz and 200hz.