Have you talk with support?

Hey guys! Does anybody notice a weird low noise from AMP - if you touch ON/off or gain switch, while unit operating... Also noise become more HISSSS if I plug a charger to AMP & listen music in the same time?

Oh one more thing - does anybody compare NFB-28 and Burson conductor on same ESS chip?

is it 2016 ver or older?

Hi everyone! I`m considering to buy NFB-28 model. And I was wondering is there any lag of quality or often issues with UI in 2016 version? I mean should I expect any factory defects?

Finally got back my balanced amp card after modification!  good things: definitely better pairing with low impedance headphone. Modification doesn't change character of sound dramatically, it become more dark and private, solid and bodily. Ty Segall, Sam Flax, Thee oh Sees, Cherry Glazer and...

Does anybody know what kind of amp card is this http://nxtmarket.info/item/521297722197

Costs was about 10-20$ for components & about 50$ for work.  Oh I forgot to mention - hifiman support team told me that with elfidelity balanced card impedance will not change. But since this card will not work in full potential with original 901 because of gain switch & hifiman not planning to...

I`m gonna get my modded card in next 3 days, so if anybody interesting - let me know & i`ll post my impressions. Just one thing, i`m not own any IEM`s, using HE500 with my 901 via balance...

Yeah sorry for my perfect russian ascent.... Here is manual https://docs.google.com/document/d/1vR4H6f6WK9EWMZwnMEkL1RZMcCzcnIjvJ6cA2qvmsOI/edit   It`s in russian but you guys feel free to ask any questions

let me be more clearly.... This is modification of original balanced amp card. The thing is - when you switch from normal to balanced mode, impedance of amp card will become about 12ohm. And for headphones whose impedance lower than 80ohm - sound character will move to high frequency. In two...

This is modification for iem & headphones witch impadence lower than 80 oms.

If you using an IEM with balanced amp card, you may interesting in UFO modification of it.

I`m pairing my 901 with HE500, so I was really hope that elfidelity will improve my listening experience...  But from another side, that`s good that I figure out about output limitation before order new amp - never wonted to be a beta tester...

For all those, who like me were interested in new Elfidelity amp cards. Thats what I`ve got from hifiman support team a couple days ago:   According to our technician, the high/low gain  on the HM901 will not work with the EIfidelity amp card. So it will be neither high gain or low gain with...

Yea, with 901s/901u gain works this way because unlike original 901 there is no physical button on the side of unit. As I right understand there is a difference between FW`s for 901 and 901s/901u, and original 901 with latest FW doesnt have gain switch in the UI menu.

Is it with 901 or 901s/901u? 

Hi everyone! I`m thinking to buy elfidelity full balanced card instead my original balanced. There was an info in this topic some pages ago - that you loosing hi/lo gain switch, when you use original 901 with new amps from Elfidelity and Gold minibox. So I was wondering can anybody confirm this...