Fully tested. The grill does not remove. These have fairly intense mid and high range and should be used as speakers supporting a bigger pair. They can also be a nice bookshelf Speaker pair.  The Advent surrounds do break down due to age.  These don't sound  broken down but if you drive them hard or poke your finger through them they will likely break. I'm not certain why some Advent surrounds are bad and why some are good.  All I can say is these play and sound great.