FiiO K9 Pro Hi-Fi DeskDop DAC&Bluetooth&Amplifier,XLR/RCA/4.4/Optical/Coaxial interface
May 2, 2022 at 6:46 PM Post #1,606 of 2,223
Decided to return the unit. Unit itself is great but the firmware seems too buggy. When switching sources audio cuts out, and requires a reboot to get it working again. Even with this issue, they are charging me a 20% restocking fee..... dumb. Prob the last time I purchase from Apos/Fiio again. Not the best customer service in my opinion
 
May 2, 2022 at 6:59 PM Post #1,607 of 2,223
Decided to return the unit. Unit itself is great but the firmware seems too buggy. When switching sources audio cuts out, and requires a reboot to get it working again. Even with this issue, they are charging me a 20% restocking fee..... dumb. Prob the last time I purchase from Apos/Fiio again. Not the best customer service in my opinion
Is this switching between wired sources or from wires to Bluetooth? I would assume the Bluetooth source pauses the audio playback when it loses connection. Did not experience the audio cutting out till reboot issue.
 
May 2, 2022 at 7:38 PM Post #1,608 of 2,223
Decided to return the unit. Unit itself is great but the firmware seems too buggy. When switching sources audio cuts out, and requires a reboot to get it working again. Even with this issue, they are charging me a 20% restocking fee..... dumb. Prob the last time I purchase from Apos/Fiio again. Not the best customer service in my opinion
I’d fight that vigorously with them and your credit card company. I returned to Amazon with zero issue for the same problems.
 
May 2, 2022 at 9:11 PM Post #1,609 of 2,223
Decided to return the unit. Unit itself is great but the firmware seems too buggy. When switching sources audio cuts out, and requires a reboot to get it working again. Even with this issue, they are charging me a 20% restocking fee..... dumb. Prob the last time I purchase from Apos/Fiio again. Not the best customer service in my opinion
Yea apos has been known to provide good service, very surprised about the restocking fee, especially when there are known issues with the k9, i deal with constant pauses during play back. I just overlook the issues because i can’t find anything else that sounds better within my budget.
 
May 2, 2022 at 9:16 PM Post #1,610 of 2,223
Yea apos has been known to provide good service, very surprised about the restocking fee, especially when there are known issues with the k9, i deal with constant pauses during play back. I just overlook the issues because i can’t find anything else that sounds better within my budget.
Have you tried a different usb port? If it is using USB source. Maybe use the motherboard USB instead of front header, etc
 
May 2, 2022 at 9:23 PM Post #1,611 of 2,223
Have you tried a different usb port? If it is using USB source. Maybe use the motherboard USB instead of front header, etc
I learned to live with it, it doesn’t happen often, maybe one time for every 2-3 hours of playback, and it’s a really fast pause, lasts about a second.
 
May 2, 2022 at 9:25 PM Post #1,612 of 2,223
IMG_20220502_182159__01.jpg

Power consumption when playing music from USB source and 4.4 balanced out at medium volume.

Poweroff consumption (hold standby button)
IMG_20220502_182235__01.jpg

I have to say, this is amazingly efficient. So many times I have run into amps that drain almost as much when turned off as when they're turned on. Looking at you Onkyo...
 
May 3, 2022 at 1:58 AM Post #1,614 of 2,223
May 3, 2022 at 4:57 AM Post #1,615 of 2,223
Yea apos has been known to provide good service, very surprised about the restocking fee, especially when there are known issues with the k9, i deal with constant pauses during play back. I just overlook the issues because i can’t find anything else that sounds better within my budget.
I used face similar issue with k9 in high gain the unit kept on switching in dac mode and hp mode.
I asked fiio about the issue they gave this firmware which delays the input/output changes by 2 sec and resolved my issue.
Not sure if its same with you but i suggest try loading the driver with 2 sec delay and see if it fixes the issue for you.
https://www.head-fi.org/threads/fiio-k9-pro-hi-fi-deskdop-dac-bluetooth-amplifier,xlr-rca-4-4-optical-coaxial-interface.952664/post-16761329

For me the tiny digital switches in the front kept on changing to different output mode after 10 or 30 secs good thing I had a speaker pluged in on RCA output which. I noticed the output kept on changing from Headphone to speakers.
Hopefully Fiio include better analog/digital switches in front.
 
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May 3, 2022 at 2:48 PM Post #1,616 of 2,223
Impressions after a month:
  • No complaint on sound quality: clean, balanced, authentic
  • Powerful enough to push either AKG 702 or Beyerdynamic 770 Pro 250o to whatever level
  • Good driver/AISO works perfect with foobar2k, the driver seems licensed from Lisk Audio
  • Background is super black, high-gain, max volume and absolutely nothing from Beyer
  • Rock solid build and heavy, love the look and feel; it only gets warm not hot
Problems:
  • Gain and Mode switch feel a bit flimsy comparing with rest of the controls on the box
  • Sometimes the FiiO works fine but iOS App can't even find it (on both iPhone and iPad); requires a soft-reboot on FiiO, long press the front power switch then back to get it going again; funny thing is while FiiO App can't find it, iPhone can still play music through BT
  • iOS App seems half baked, EQ doesn't work on all inputs except BT
Really looking forward to a firmware update to make it perfect!
 
May 3, 2022 at 4:24 PM Post #1,617 of 2,223
Yea apos has been known to provide good service, very surprised about the restocking fee, especially when there are known issues with the k9, i deal with constant pauses during play back. I just overlook the issues because i can’t find anything else that sounds better within my budget.
I think the restocking fee is in there return policy. But still very high. Apart from that they do have good customer service.
 
May 3, 2022 at 9:06 PM Post #1,618 of 2,223
@FiiO and @FiiO Willson, after months of use, I'm still getting the very annoying clicks/pops on playback with my Fiio K9 Pro AKM version. This happens when the volume is in approximately the 11 o'clock to 1 o'clock range. Any word on a fix for this? I'm running firmware revision vB.18.

If there is no fix in the works, is this issue covered by your warranty?
 
May 3, 2022 at 9:08 PM Post #1,619 of 2,223
@FiiO and @FiiO Willson, after months of use, I'm still getting the very annoying clicks/pops on playback with my Fiio K9 Pro AKM version. This happens when the volume is in approximately the 11 o'clock to 1 o'clock range. Any word on a fix for this? I'm running firmware revision vB.18.

If there is no fix in the works, is this issue covered by your warranty?
Are the clicks/pops happen when you just turned it on or when you haven't played anything for a while? There is some actual switches that causes that noise when you first turn it on.
 
May 3, 2022 at 9:09 PM Post #1,620 of 2,223
Are the clicks/pops happen when you just turned it on or when you haven't played anything for a while? There is some actual switches that causes that noise when you first turn it on.
This is a known issue that many users have reported. Look at my previous posts for more context.
 

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