Well... I've had my L166s for a couple weeks now. I refoamed them myself.... now I'm getting a fluttering sound.... I small peice of the glue broke from the cone pushing them real hard. I reglued that 1/2 inch long section and put a little extra glue around the edge of the cone. I let them dry all night and I'm still getting this fluttering sound. There wasn't any other portions that the glue broke that I noticed. I'm not saying that it's impossible... just that I don't think so.
I did not get anywhere near the range that these would blow... I didn't even have the hooked up to my main receiver I bought for them. I had them hooked up to my modern Pioneer VSX-D514 that only pushes 120 watts peak per channel. (Though I did get an overload shut off.)
Any thoughts on what the problem could be? I would investigate further but I bearly had the time to post this.