i have obtained the MusicMaker quad BA enhanced and am I impressed?
Yes, yes I am...
This thing is very neutral, bass is tight like Classic BA bass. Mids are slightly, slightly forward and highs extend and resolve very nicely. Soundstage is taller than wide but still reasonably wide. Just above average size but imaging and separation are top notch. Details are superb too, sounds similar to the fidue A73 but taller, leaner and airier. It doesn't have the enhanced hybrid bass like the A73 so the whole signature sounds flatter. This is a winner in my book and after only 3 hours of listening I'm loving the neutral tuning of this beast. It's driven by my J3 just fine which is great, but sounds better from my X5 because of its better DAC. I haven't found a fault yet an have only good things to say. This is a refined and well tuned iem that punches up to the top of the mid tier for sure IMHO. MR Z has tuned a neutral iem into his line up and I wish I owned the 535 or 864 to compare it to.
I can't find the link but you can view it on the MusicMaker Taobao store and I bought mine through HCK on Ali and of course the other top two Ali seller could probably obtain it for you. Just message them.
These are just my 3 hour impressions so they may change over time but separation gets a special mention with these because they separate like (from memory [Thanks to Tamal] the mighty VE Duke).