It depends on the speaker. I own Hales T-8s and Hales Cinema Centers. On these speakers, Audioparts Inc. accurately described the process. Just grab the grills from the bottom and slide them upwards. For the T-8s, of course, make sure you have sufficient ceiling space (approx. 8.5 feet).
Hales Design Group Speakers...Removing the Grills
I am looking for instructions on removing the grills from Hales Design Group speakers without trashing the material. I'd also like to be able to put them back on :). I found some instructions suggesting that you lay them on their back with some books to space the binding posts off the ground...any more technique than that and pulling/prying? How are they actually held on?