On October 23, 2017 at 17:16, SB Smarthomes said...
Maybe it's not really ground water, but just water filling up the hole you dug for the subwoofer faster than it can drain out. The manual says something about adding gravel to the bottom of the hole if the soil doesn't drain well.
This is probably what happens. When a pool is being constructed they place hydro static relief plugs so the ground water and pressure doesn't pop it out of the ground!
If water can do this, it can certainly pop a sub out!
