These are not shown with the LEDs but are the same basic idea.
They were made for a few different reasons:
-Boston grill was bigger than the Bullet can and we wanted it to be flush with the edge.
-Boston SL speakers have a 3 hole mounting pattern that isn't symmetrical.
-There is an option to add LEDs behind the clear portion of the ring.
-Black acrylic trim looks better than any other grill option that was available.
-The customer did not request LED rings but did request a clean install.
Our router table was down that week so this is the result of some work in my garage after work.
Here is the end result:
Its hard to tell in the pictures but the speaker is actually sandwiched between the two pieces of acrylic and the 3 mounting tabs were cut off of the basket.
If the primary intent was for LED rings the clear would have been made with 1/2" or 5/8" with a frosted edge.