This seems to vary between people. That graphed difference would definitely be huge for me based on my graph listening experience. However, I have very good hearing and I'm very particular about my sound. But then aren't most people who buy the er4s?
I make 1db changes with eq and hear a noticeable difference if there are a few here and there (such as my "flat er4s" eq setting I posted). Others simply might not be as sensitive to the changes. I'm not sure. But for me that would be too much change by far. I wouldn't take half of that boost. If things were 1 to 2db here or there, but the comfort was a million times better, sure that might work. But that isn't the case to my ears personally. But if you don't mind it, by all means enjoy your er4s with custom tips.
You can put the filters in the end of the tips rather than in the earphone to change the sound. I say "change" and not "improve", because while it does lower some of the treble spiking, it also cuts out a lot of treble. So you need to choose where you want the loss of quality. But if someone had bad high frequency hearing that might be a better option.
lusident, I don't have any high frequency hearing problems; this was tested about two months ago at my local audiologist.
As I said I decided to buy the custom tips only due to the seal issues - I wanted to have a constant seal and not the seal which can be easily altered for example while moving my mouth or head.
I must admit that I did not have a time to compare one to one Etys on triple and Etys on the custom tips but my first impressions on the custom tips (once I received them) was that the sound is different but it is not night and day. Of course I based my first impressions on my memory so maybe once I do the one to one comparison I will have the same impressions as yours i.e. that the peaks in the treble are hughe.
Generally I see that a lot of people actually alter the original sound of Etys on the green filters for example by using the red flters or any others.
Edited by shakur1996 - 10/29/13 at 2:38am