I hav k850i since last year, updated to R1EA037 via SEUS.
The standard bundled HPM-62 seems didn't satisfy enough, so I bought HPM-85.
Very powerful output, deep bass, clear and crispy treble.
One weak points I only noticed in HPM-85:
Mid-range sound was not clear.
And for information, bass-style is natural-soft, compared to hard-unnatural-knocking style in HPM-82 (maybe to maintain a natural and high fidelity sound. It's a taste of matter).
Good sound quality in general, high-fidelity type, thankfully to it's 30mm neodymium magnets that can handle 500mw power.
And right now, I hav a plan to buy HPM-90.
On technical comparison, hpm-90 hav 5mm neodymium magnets (smaller diameter means different impedance, leads to less power-handled than HPM-85. CONS), with oxygen-free cable (means less signal-lose in cable. PROS)
I ask to every peoples here that hav try HPM-85 and HPM-90: Which sound quality is better?
Please writes your opinion about bass, treble, stereo and hi-fi factor between this two product.
Don't mention about it's OLED display or simple-to-bring factor.
Since I'm audiophile, I only pay attention to sound quality factor^^
Please help me, because I feel uncertain to buy HPM-90. Should I buy this one?
If the sound quality is better, I will buy that.
Although it offers OLED display and smaller dimension, if the sound is worse, I will not buy that.
Thanks for your attention^^
Hiron