Avalon Acoustics?

They make a good speaker, however they use mostly Acuton diamond and ceramic midrange drivers made to their specifications. The bad news is  if you need to replace any drivers  they have to be purchased from Avalon and their pricing is extremely high. Got abused once and will never do that again.

I agree with you in regard to their drivers not made to spec. I purchased new mid range drivers from them and they were  at least 1/4 “ higher in overall thickness and the wire attaching device was reversed in terms of polarity compared to the original one it replaced. I think they sold me knock off. 

Yes, there was trouble with mounting the new mid range in the Isis speaker and it's deeper thickness did break the the silicone ring and also forced the back glue all over the back. Although they have a beautiful looking speaker their prices have become out of control and they are no longer competitive with other great sounding speakers.