Great review, very concise!
 
Do you know if the bass is more sub-bass or mid-bass focused? Or is it linear all the way down to 20Hz?
 
Thanks

Hey thanks!
 
There seems to be a ~10db rolloff from 30 to 20Hz. After that it seems pretty linear.

Hey, any comparison to the older westone 3?  They are very similar I think Its just the more improve model of the westone 3.

Thanks for the review! Ive been hunting for another good pair of BA IEMS after being so pleased with my Shure SE535. Definitely on my consider list now!

jeffisflyboy I haven't tried the 3 but from what I read it seems the W30 got rid of the mid-bass bump and the occasional sibilance of the 3. 
 
Thanks zbeazer

wow that is so good to hear.  I used to own the westone 3 before and, although I really astonished by the expansive sound signature, I just can't  help but noticed the sibilance and a very piercing treble that I can't listen to it for more than 10 mins.  I wish its available in my country now and hear for myself

jeffisflyboy you shouldn't have anything to worry about. I see you have the Dunu DN1000. If you find them sibilant at high volumes like I do, rest assured the W30 is much much better in this regard.

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nice review, they sound and fit better with the Comply tips, the isolators drastically improves the detail. I found them more comfortable too.  If you are in a situation where you need to hear alarms, calls or someone speak, use the Comply active tips. 

I am also in the haunt for a 300-400 $ iem and i had into consideration the fidue a83 and t-peos h300. I am leaning towards the fidue but now that i read your review am confused. Am not a die hard basshead , but I enjoy some bass rumble aka not a dry plain sound. Also i would prefer iems with upper mid forward sound , with sparcle and a ton of detail. What would you reccomend ? Fidue or w30? Your opinion is very important. Can you compare them in more detail?