I also used the blow dryer trick on my ALiii ribbon. My speakers were fine for 2 years until one day when it was really humid. Then I heard a slight vibration or buzzing sound from one ribbon. I remembered reading somewhere on a Carver forum that they did not like humidity. I used the dryer on low heat, and not too close to the ribbon, and moved it across the front with the foam still on for about a minute. I didn't use them again until the humidity was down. I have not heard the buzzing at all since then- about 2 months. Bob