with pre the volume regulation of k9 is used. dac is fixed (max) output. If you use volume regulation of other amp I would use dac mode.

seems fiio picked up my workaround to make it more readable Self made stickers ... (looks more ugly on the picture as in reality..). Meanwhile I used a 24mm wide band for the lower sticker to have it in one piece. A big sticker for the whole front would be even better, then it would look more...

The volume drop issue is solved with system firmware beta 18. The only thing that I could not make work is bluetooth from Win7 to k9pro. (win10 / win11 /android phone worked) I also got fiio control app 0813 for android with which I have the volume control, which was not there on my android...

It meanwhile works on a win10pro pc (internal ASUS/Intelchip pci express wireless/bluetooth card) and on a win11pro mini pc (internal m2 intel ax210 wireless/bluetooth card) I don't know why. I only moved the k9pro to the win10 room (disconnected power cord), but there it did not work. now i'm...

I tried firmware b15 and b18 and with both I can't make it work. win7: bluetooth device k9pro can be seen, but win7 device installation fails because it can't find a driver win11: bluetooth device k9pro does not appear in the device list, so I can't connect probably the beta firmware is the problem?

only with computer (win 7 and win 11). with android smartphone it works meanwhile (I had to switch the output to dac and back to hp, but computer doesn't see the k9 at all (win 11) or it sees it but has no driver (win 7). Firmware I have Beta B18. I had Beta 15 before but same behaviour.

just tried to do a bluetooth connection with win7 . win7 saw the k9pro device, but when trying to connect it said it has no bluetooth driver for the bluetooth device. FiiO USB drivers are installed and others I did not find - hoped the usb drivers include bluetooth drivers too. @FiiO: is it...

isn't it possible to just rotate the hp-out part downward, then the usb otg is on top.

you can adjust volume with app through BT in all modes (tried with coax) so BT module can not be de-energized without loosing App-control. has anyone win11 and tried BT to k9pro? I just installed a new Win11 with a intel ax210 bt 5 card. But I can't see fiio k9pro. Is this not possible with...

All BT Modes are activated (or better none deactivated) and when I check the bt mode of k9 with fiio music or with fiio control the k9 is in the mode "aptx adaptive 48khz" (also the BT setup of the phone says it is aptx adaptive 48khz connected). The music file that I play is normal wave 44.1...

@ATimoff: I also just wondered what happens with my CD quality files (44,1khz) when bt mode is like now aptx adaptive 48khz then the phone does a upscaling to 48khz ? Is there a bt mode "passthrough" or a player app that can transfer the original file directly to k9pro, so that k9pro plays my...

sorry for several posts in a row ... i go through the posts... I have now the volume of phone increased to max (even higher than recommended .. the phone asked me if I want to go higher than that) now the volume output of k9pro is normal (listening at 1 oclock as with coaxial input). And I...

yes thats the case. I connected pc speaker. I now switched to dac and back to HP. Now I have output to HP, but its not usable ... i'm now on high gain and 100% (max) volume knob and I just hear it. The volume at 100% with bt in is only as loud as on coax input and volume at around 10 oclock or...

yes fiio control app looks everything fine. It also looks fine in music app under bluetooth connections or so. everything looks fine except that the k9pro has no output on headphone when I play music.

I don't get sound with bt input too (HP mode). I have b15 beta firmware. I have no other cables connected in the moment, only the hp (and power cord). Same effect: I can connect from mobile phone and I can adjust the color-ring-brightness and the bt-mode, so connection works, but no sound output...

I tried with the new app version to connect through bluetooth (used usb and coax before). My new android 11 sees the k9pro and the music app connects to it too, and the sound doesn't come off the speaker of the phone as soon as the k9pro is connected, but the k9pro stays quiet - no music...

yes, exactly this kind of toggles I had in mind when I first used the 3 way toggles and thought: these toggles will not last long when used often. But hopefully I'm wrong and they have a good long time stability.

its not perfect, but in low light you only see the text and I dont need now a flashlight to read the labels...

I have "improved" mine with printed Labels (Brother Label printer p-touch cube). I'll attach the label files too. (the reflection on the volume knob is my dvd-board, if you wonder)

I had the problem to find the scratch code. There was a sticker on the outer brown box which only looked like it is the scratch code (nothing to scratch there). In the end I found the real scratch code sticker on the inner (black) box. And it authenticated on the fiio website.

I've got with the beta firmware a new app version to test too. And with that I have a volume control in the app and I can control it. (android 8 and 11 worked). So just wait until the new app version comes. In the 2.6 android version I even did not see a volume control in android 6 and 8. and...

I just got the new beta firmware b15 from fiio and all the problems I had are solved. - no volume drops - no clicks (never had clicks) - sound detailed and clear (hd 650) with punchy drums and crying e-guitars - listened on high gain at 12 to 1 oclock position. - new app version (beta from fiio)...

or instead of the whole ring in changing color, devide the ring in colors sectors, then one doesn't need to remember what the color means and can recognize it through the position (and color). Or even devide each color sector into the 3 bit subsectors. 1 blue subsector = 44/48khz 16bit, 2 blue...

I think you can set it up with the fiio control app (i have android app v2.6 in the moment). I could choose between off, ring and multi ring and when not on "off" I had a scale from 1 to 5.

3 posts above i've attached a recording of a volume drop. I meanwhile did a test with line in instead of digital coax in ( the line out I used the last years with my headphone directly connected to and which never showed volume drops). Result: I had a drop after around 2 min and around 20 sec...