Hello, My system is set in a room with a full southern exposure and has large windows on the south wall. My stereo system is on the west wall of the room. So the left channel speaker always sees the sun for the first half of the day. Over time, will the sunlight have an effect on the foam rubber edge of my low and midrange drivers? Possibly fade the finish of the speaker cabinet?
Elizabeth is correct. You could hang a sheet of mylar with tape to block the sun and take it down whenever you want. Sunlight can damage lots of things like car interiors, speaker cones and (fade) cabinets. You could also tape mylar to or just use cardboard for the temporary sunlight. Best of luck.
Check out a website called shoreshade.com...they have roll down UV transparent shades that are like sun glasses. Very effective. If their prices are not in your range there are a number of sites that have UV pull down roller shades at different price levels by doing a Google search.
heat and uv will definitely accelerate the deterioration and aging of the rubber driver surrounds. naturally, as the elastomers leak out, they get super brittle and crumble with the slightest of touch.