WOW Steve! This was one question I'd have bet money couldn't be answered here. I was going to suggest that Din contact a medical expert. I figured a medical expert in this field (such as you) would be more likely to know about the danger a speaker's magnet might pose to an ICD, than a speaker expert would know about the subject. What I didn't figure on, was that a medical expert on the subject would show up here. One hell of a first post. Well done.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton