Glad this info could be of help to you.
Not wishing to go off forum, and only in the spirit of IEMs that match well with the Pro 6, I will elaborate a little: I like the JH Audio IEMs sound sig and tonality for many reasons, main ones being a) clean, "effortless", and non fatiguing sound (Jerry Harvey designs these IEMs to be worn by musicians for *endless* hours without sound fatigue setting in, b) they are not shrill, sibilant or harsh at the high end frequencies (harshness and sibilance is my biggest hate in many other IEMs), and c) they are very accommodating of any genre you may like. Over the years I find my genre leanings evolve constantly (over the past few years I moved from EDM, to country music, to deep-house/nu-Disco, to lately acoustic guitar with male/female vocals), and these IEMs played beautifully with all these genres. They have been described by others as a little "warm" leaning, rather than clinically neutral. But that suits me fine.
The key thing here though, is that they are great match in my humble opinion to the Pro 6 (besides there being no hissing issues whatsoever).
I would say at least try and audition few of their IEMs if you can, just to see if they are to your taste (they also market some IEMs under the Astel and Kern brand collaboration). They have a few offices around the US, hopefully one is close enough for your to go and audition. Their own brand IEMs are not the cheapest, and range from USD 800 to USD 2600 (the ones co-branded with Astel and Kern start at less, around USD 400 or so), but perhaps you can pick something on eBay if outright new is perhaps not in your budget. I have been very patient in buying mine, spending months scouring the Internet to get discounted ones.. including from Japan and Hong Kong.
I think I will stop here so as not to *really* go off topic, but if you would like to know more on the above, feel free to PM me.
