I have been trying out various tips with the Havi B3 lately - because I wanted to get as flat and, beyond all, EXTENDED treble. Preferably well past 20 kHz - in order to be able to hear the difference in the same music in two files under ABX comparison. One being in original, "unlimited" beyond 20 kHz response, another limited by the redbook CD standard, which should have absolutely nothing beyond 22.05 kHz ( half of sampling ratew of 44.1 kHz as per Nyquist).
Havis are notorious for fitting/sealing problems - due to their size/shape. They are not impossible to get right - just much more difficult than usual. If you have read my previous posts, I noticed that I usually use them under mufflers ( Peltor Optime III ). This further excerbates the tip selection/suitability/repeatability of the result - as mufflers do touch the Havi ever so slightly, disrupting the seal and/or positioning of the Havi, leading to "funny" results, which are of course the last thing desired.
Due to this interference with mufflers, I settled on using medium eartips which came with XKDUN CK-M700 ( small bore ) or those mediums that came with XKDUN CK-820 ( and turned out were the same ( but for the colour ) - as also supplied with Superlux HD381F and Philips SHE3581 (larger bore ). Both would stay in place and seal well under mufflers. Both of these mediums fit/seal - but only JUST when used normally, without the mufflers. Opening a mouth, even far less than a normal yawn, results in loosing the seal.
However, I did notice that treble was not so great; nothing annoying, certainly no sibilance issues ( please note my Havis are well burnt in by now, taken together probably exceeding 1000 hours of use mark by now, so sibilance from new out of the box is NOT an issue ) - but "air/extension" in the treble was missing. For the life, I could not hear any difference between files with unlimited and limited response beyond 20 kHz using ABX comparator in Foobar2000. Either Stax Lambda or AKG K1000 made this differentiation possible - but not the Havi using mentioned tips.
I tried then each and every tip in my possesion - and got the treble result I was after by using large bore tips from Xiaomi Piston 2. Funny thing - although I usually end up using medium size tips, this time it was the L size that did the trick. For those not familiar with the Xiaomi tips - they are EXTREMELY thin/supple, they are far more fragile than any tips I am aware of, yet used properly ( you have to insert them REAL gentle - or else they wrinkle instead of keeping the form in order to seal properly - pushing them into the ear produces exactly the opposite result than desired ) they are super comfortable over long periods of time and offer great SQ.
But unfortunately they proved to be too much hassle with mufflers - whatever tiny interference there remains with mufflers, it is enough to throw the Xiaomi tips out of balance. Without the mufflers, large Xiaomi tips provide the most secure AND comfortable fit for my ears - while allowing most/all? of the treble to come trough. Since most of the people do not use mufflers , this is a non issue.
Xiaomi bore is VERY similar to the bore used in JVC Spiral Dots ( but without spiral dots, of course ) . I am going to order Spiral Dots in M and L size ( hard to tell which one would fit - does anybody have the EXACT measurements of JVC tips L/M/S ?) - and will update after I receive them.
These should sound even better while hopefully being man enough to alow the use of mufflers while still sealing properly.