[itsnein]

thank you for digging up post #617 So the ESS variant might be a full decoder - we'll have to wait and see.

No.
Same xmos208

 

[Vitaliy Belz]

No.
Same xmos208

Something is not clear to me, 208 or 308?
https://www.fiio.com/k9proess

 

[itsnein]

Something is not clear to me, 208 or 308?
https://www.fiio.com/k9proess

208
https://fiio.com/k9proess_comparison

same as AK model.

U308xx - its model number.
xmos.ai/download/XU208-128-TQ64-Datasheet(1.9).pdf
XU208-128-TQ64-C10 U30870C10 Commercial 500 MIPS

 

[ATimoff]

Friends! An image from this forum. What microchip models? Buffer + LPF for RCA? Tell me who knows.

 

[fenom60]

Is anyone esle getting this problem of the K9 pro losing signal? The problem is when I am on the PC , I watch youtube, then I switch to Tidal, it will lose signal (no sound in Tidal) unless I cycle through the inputs one by one slowly back to USB on the K9 to get sound back. Every time I use K9 pro as exclusive, such as Tidal or Foobar2000 and then switch to something esle like watch Youtube or a movie on VLC, there will be no sound unless I cycle through the inputs (slowly one by one)? Any fix? Its been happening everyday, and I am very tired of cycling the inputs to get sound back when I switch from watch one thing to another (such as youtube to Tidal, Tidal to Youtube, or Foobar2000 to youtube). Its getting really annoying and I want to return it. My K9 pro is running latest firmware.

 

[FiiO]

Dear friend,

The beta firmware is not Bluetooth firmware so it should not affect Bluetooth connection.
The Bluetooth transmitter is in your computer or the Ugreen one?
My colleague tried to find a Ugreen driver, you could check whether it helps: https://www.lulian.cn/download/22-cn.html


Best regards

Dear friend,

Please check whethrer the Bluetooth antenna(within accessory box of the K9Pro) has been installed to the K9Pro properly as well:

Best regards

 

[FiiO]

dear @FiiO , can i please ask for a clarification on the MQA implementation of the K9 Pro:
1. your product page says "The K9 Pro supports MQA Renderer" while the MQA page says "provide full decoding". So is the K9 Pro an MQA renderer or full decoder?
2. will this be the same for the K9 Pro ESS? (There is no product page yet for the ESS version)

thank you

Dear friend,

The K9 Pro supports MQA Renderer and same for ESS version.
My colleague are contacting MQA for checking the page you mentioned. Thanks for reminding.

Best regards

 

[FiiO]

Is anyone esle getting this problem of the K9 pro losing signal? The problem is when I am on the PC , I watch youtube, then I switch to Tidal, it will lose signal (no sound in Tidal) unless I cycle through the inputs one by one slowly back to USB on the K9 to get sound back. Every time I use K9 pro as exclusive, such as Tidal or Foobar2000 and then switch to something esle like watch Youtube or a movie on VLC, there will be no sound unless I cycle through the inputs (slowly one by one)? Any fix? Its been happening everyday, and I am very tired of cycling the inputs to get sound back when I switch from watch one thing to another (such as youtube to Tidal, Tidal to Youtube, or Foobar2000 to youtube). Its getting really annoying and I want to return it. My K9 pro is running latest firmware.

Dear firend,

I have PM you the latest beta firmware for you. Please try whether the issue remains?

Best regards

 

[FiiO]

Friends! An image from this forum. What microchip models? Buffer + LPF for RCA? Tell me who knows.

It is our customized OPAMP.
You could check this teardown for more information:

Best regards

 

[ATimoff]

@FiiO Dear Fiio, thanks! Very visual and creative image. Let me ask again. Are there any other changes in the ESS version besides two DAC modules? And about the "customized OS". (I seem to be on the right track!) Are these op amps for RCA line out or RCA line in? Can they be accidentally damaged by static electricity or a short circuit? Had a bad experience with this ....

 

[fenom60]

Dear firend,

I have PM you the latest beta firmware for you. Please try whether the issue remains?

Best regards

Thanks! I will go home tonight and try it. Really love the features and sound of the K9 pro, would really hate to return it.

 

[MikeKim]

Does anyone try to connect K9 pro xlr output (at the back) to topping A90? So using K9 pro as a pure DAC, how its sound? I have the A90, so curious about it. Thank you.

 

[azertyproxy]

Does anyone try to connect K9 pro xlr output (at the back) to topping A90? So using K9 pro as a pure DAC, how its sound? I have the A90, so curious about it. Thank you.

Hi, i don't know about xlr output but i use the K9 pro in Dac only mode and output the sound to a Marantz amp through RCA and it sound reaaaally good, even better than in pre amp mode.

 

[ATimoff]

And I have a Marantz 7*** amplifier. Acoustic speakers "B&W" 4 Ohm. Crystal sound in real Hi-Res. The Marantz 7*** amplifier has a frequency response up to 100 kHz (-3 dB RCA). And the k9Pro's line output (RCA and XLR) is clipped to 20kHz (-3dB). By the way, the balanced headphone output of the K9Pro has a range of up to 50 kHz. For what reasons?

 

[MusicalDoc8]

Is anyone esle getting this problem of the K9 pro losing signal? The problem is when I am on the PC , I watch youtube, then I switch to Tidal, it will lose signal (no sound in Tidal) unless I cycle through the inputs one by one slowly back to USB on the K9 to get sound back. Every time I use K9 pro as exclusive, such as Tidal or Foobar2000 and then switch to something esle like watch Youtube or a movie on VLC, there will be no sound unless I cycle through the inputs (slowly one by one)? Any fix? Its been happening everyday, and I am very tired of cycling the inputs to get sound back when I switch from watch one thing to another (such as youtube to Tidal, Tidal to Youtube, or Foobar2000 to youtube). Its getting really annoying and I want to return it. My K9 pro is running latest firmware.

Try setting the ASIO buffer setting higher, it happens that when it's too low it can get the player stuck. I now use 4096 samples and i had no more issues.