Quote Originally Posted by Bernd
http://cgi.ebay.co.uk/ws/eBayISAPI.d...7369&rd=1&rd=1

Apparently they had the best HF unit ever produced. You will need a reliable supply of Helium though.

Peace

Bernd

I remeber reading about them. I do not remember if it was the Hill's or another speaker that used gas for the tweeter but the problem was it created ozone when in operation.