Hi Onik, I am using the B4-X with IEM Shure 846 with very low impedance with no problems whatsoever. Sounds really good. Very light distortion, with a Tube touch. When I am back home in China I will try it with my HD800 with TRRS balanced cable. Will let you know.

Thank you for your answer @JaZZ. I am very happy with the Hugo/HD800 combo. Simply fantastic !

Hi roskodan, which amp would you recommend ? Thanks,Alwin

Hi montanari, which portable amp would you recommend for the HD800 ? Thanks, Alwin

My Hugo is working miracles on my HD800... Thanks Chord!

I have tried with my mobile phone... but that caused other interferences... I will try with my iPod tonight. I will organize some copper film and isolate the case from the inside and correct the grounding as someone did before (explained in this thread).

if I touch other parts of the amp it has no effect. Only if I cover the small window with my hand...

BTW, feeding the B4-X via "line out" from the AK240. Volume level increased dramatically...

Hi Onik, the balanced cables (Litz) for my 846's have arrived yesterday. The balanced output of the B4-X works well. Soundwise there is a little bit more distortion noticeable in the very low as well as in the very high frequencies. Don't know whether it is the cable or the amp. Ordered another...

here comes a pic of the opamps

not yet, need to order a cable

sorry about that :-)

Hi again, sorry for not introducing myself in my first post/reply. My name is Alwin, I am from Germany and have lived overseas for now 31 years. The last 19 years of those in Shanghai, China. I am a 2-channel music aficionado and listen mostly to Jazz, Blues and Classic (absolutely a Bach fan)...

I was also surprised. No noise floor hissing despite the super low impedance of only 9 ohm (? as far as I know) on the 846's. But maybe I just played the music too loud...

Hi guys, I have received my B4-X yesterday. I left it on the charger overnight and then tried it with AK240 as a source and Shure 846 IEMs. Great tube sound. Battery lastet for 6 hours and 15 minutes