Any thoughts?

[srbmsun]

Any thoughts on the

Astell&Kern ZERO2 Advanced Quad-Brid In-Ear Earphones​

 

[huangw]

I haven't tried it, so I can only comment on specs and design:

1. Distortion of 0.7% at 1kHz is a bit high; maybe it's even higher for other frequencies?
2. Impedance is really low and sensitivity is highish, so any noise from your DAC will be crystal clear, and you have to be careful of oversaturation when using some high powered amplifier. Basically, don't forget to turn down volume before plugging it in...
3. It's really expensive...

But mostly I have a question/statement. Bookshelf speakers typically have only two drivers, with good crossover. How would it be possible for an IEM of this size to be able to crossover frequency ranges of 6 drivers as well as a bookshelf?

I would wait for someone to do measurements on it and test it against cheaper IEMs before purchasing.

 

[huangw]

Sorry for double-posting, but I'm really curious about IEMs with MEMS transducers like the Singularity ONI: https://singularityindustries.com/products/oni

If you're in the market for 1000USD IEMs, they might be worth taking a look at... if you find any to try, let us (me) know how they sound!
Ugh, actually the mems montara speaker used in these earbuds is only worth 20 dollars: https://store.xmems.com/collections/montara
Premium is a bit too high for my liking, even with additional development cost and DSP requirement (and the DSP requirement is downside to user in some cases).