I second what Jason said - Had one of my Spire start hissing like crazy. Vacuuming front and back helped the random buzz and the hiss a little but up close noticed that there was a grease/oil build up on the clear film (not near kitchen so not sure what it was).
Took the panels off the wood...
I have Spires and had the same problem. No amount of vacuuming would elimate the ticks/pop/whine. I could see a very light residue on most of the clear spars in the panel and was sticky when touched with a quetip (speakers kept in smoke-free environment). I did not seperate the stator & grills...
