Quote Originally Posted by vuki View Post
Coen, the 12kHz bump is what you get with the 288's - that's normal. The bump goes away off-axis, so the power response is usually quite smooth. I think that the response of your realigned 288's is very acceptable. I suspect that GPA diaphragms won't bring anything much better.
Hi Vuki, maybe I was a little overconfident that the new diaphragms would cure the harshness and a little too fast in ordering for shure. Well they are paid for and on the road so let's wait and see for the final verdict.
Anyhow, even if these do not make the desired difference I really would like to proceed to get to the bottom of this and make them sing in my setup. Your off axis graph for instance makes a lot if sense to me.

I noticed the 12k bump in the other 288-k graphs before. Save for what the diaphragms may bring this is suspect nr 1 next on the list. Furthermore I'm interested in your opinion on the 288-8k, do you like them all theway up, or do you consider a seperate (super) tweeter like gm suggested?

Coen