Hey another Korean! I have tried the monsters tip as well, both gel and foam and unfortunately do not work too well for me
Hey jonyoo. This is dudss' from "doctor headphone
I already have a full review on A83' unfortunately can not put it here due to it's all typed in korean.
I asked fidue about the frecuency response graph of a83' and this is what they applied'

Hi. Im mike from south korea' and I just recieved your new product A83 a few days ago and i really love it.
I really think that you made a great stuff that even can compare to K3003.
However' i d like to see the frequency response graph of a83.
I guess that its sound signature is between the flat shape and v-shape if I am right.
So if there's any chance' please send me an email with the F.r graph or tell me if there are any deeps or peeks on between 1000 -15k.
And i ll also attached the the frequency response graph of a83 that I drew while i was listening a83' and if that is close enough to the original response' please tell me .
Hi, Mike,
First of all, thank you for your support to our product.
And thank you for your email. Checked with our engineer, you graph is similar to our A83 graph, however, the low frequency is a little higher than A83, ours is more “flat” than yours.
Hope you are enjoying our products!
Regards,
Michael Lin
Business Development Director[/quote]
Oh hey dudss! Cool! I've seen you around a lot on DRHP. I was going to write a review too but been busy cause of work.
I thought the spike was between 7kHz and 9kHz and looking at the graph looks like it's somewhere about 9.