It fascinates me that Graham have really go hold of the ‘BBC sound’ for their range of speakers and found
a ready market.
Alan Shaw goes on ( and on...) about his Radial drive units being infinitely superior to polypropylene, but
Graham Audio ( and Derek Hughes ) have made a success of using poly.
There was a fascinating video of Derek Hughes describing the recreation of the LS5/9. In it he dropped a comment that new exotic cone materials used by certain manufacturers was B.S. (I paraphrase). I'm not surprised that Derek didn't stay at Harbeth for long !
There is a new video of Derek here
http://www.grahamaudio.co.uk/technology/video/
It is rare to hear from him, but always fascinating. I consider him one of the very few great loudspeaker designers. We are lucky to still have him.
He drops the comment here again about cone material.
I have not been impressed with Harbeth speakers, I have always been impressed by Derek's creations. I have spent my life listening to Quad ESL and BBC-type speakers. Derek always gets it right.
Also interesting to hear him comment on all of the old LS5/9 being out of specification - so not much point in Harbeth quoting their current performance. PVC surrounds deteriorated very quickly.