Problem: When I use the volume buttons on my Hiby R8ii I see a number from 0 to 100 changing on the Hiby, but the volume does NOT change at all.
I tried several configurations in the settings, but nothing helps. I use a headphone 4.4 mm in the lower right 4.4 input.
N.B.: If I put the 4.4 plug in the lower LEFT input, I only hear a soft hiss…
Hey @MartijnDD,
Thanks for writing in!
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Have you tested out enabling exclusive mode on the zone settings when you’ve enabled the Hiby device?
Do you have any DSP enabled within your signal path when attempting to change the volume?
Thank you for replying!
[YOU] Have you tested out enabling exclusive mode on the zone settings when you’ve enabled the Hiby device?
[ME] Please tell me WHERE I have to look. In the Roon, Settings, Audio, Device settings? I do not see ‘exclusive mode’. Where is that please?
[YOU] Do you have any DSP enabled within your signal path when attempting to change the volume?
[ME] Same here. Where please?
Are you using the DAP as a DAC to a
Pc or using the Roon Android App to play music ?
I use the Roon Android app ‘Roon’ and ‘Roon Arc’ too. Both have the same volume problem.
Ignore what Benjamin says then as that’s for using a DAC not as a DAP.
I am afraid this is likely an incompatibility issue on the Hiby are not mapping properly to the apps volume, this is something I would raise with Hiby support as not heard of this from other Hiby users using other models. I would take up with Hiby support . I had problems with certain apps when I used my R5 years ago their controls can be a bit odd and not guaranteed to work with all apps. Roon app is designed with phones in mind and will require the same functions they would use to be controlling volume for the app on a phone. But even so it should reduce the volume as it’s controlling its amp regardless. Is it not changing volume at all or just not showing the changes in the Roon app?
Using my FiiO M11 all works as it should with their volume control. So this is unique to this device if ARC also has issues.
A lot is clear to me now:
The 4.4 mm output at the right is a line out. So no volume control at all.
The 4.4 mm output at the left is the headphone out. I works fine with my B&O H6 but it does not work with planar headphone like my Susvara and not with my Audeze 4z: only hardly to hear hissing… I will contact Hiby to ask why.
When I put my planars in the 3.5 mm output (at the left), all works fine now (except for not enough power for the Susvara).
Excuse me for bothering you!
Two questions left for Hiby: why planars don’t work on the 4.4mm output. And why the volume stays to low on the Susvara… 
They are both hard to drive high impedance headphones. Maybe a mismatch.
Susvara is really hard to drive. Just a matter of power. The 4z isn’t hard to drive; it is especially developed to be easy driven. So it has something to do with 4.4 mm and planar in this Hiby device. In other devices that’s not a problem at all. I asked Hiby support now. Thank you!
Good luck, maybe just a faulty unit and they will replace it .
Hi @MartijnDD,
Please let us know what Hiby support says.
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