[kRed]

I am using the same "super slow" filter. But it is important to configure the source sampling to the highest possible to avoid the noise to be on the audible range. I use it with software upsampling to 32/384khz and it is the best sounding option for me. It mitigates the sibilant sound of this DAC.

Nevertheless, my K9 Pro AKM has some kind of ultrasonic noise that makes my ears hurt after a while. I can't hear anything but I now there's something in there, because after about half hour of using it I end mid-deaf. None of my other DACs produces that problem on my ears. And it is volume level independent. Very weird issue.

Holy crap that’s concerning…

Actually I don’t find it sibilant at all. The fact that it’s not volume related is also pretty weird.

What about if you listen at low levels? Like 60db?

 

[Bozon]

Holy crap that’s concerning…

Actually I don’t find it sibilant at all. The fact that it’s not volume related is also pretty weird.

What about if you listen at low levels? Like 60db?

I have tried to use it at very low level with the same result. My ears gets hurt and it is not for an extended period. I believe I start to feel the problem very quickly.
I have been an audiophile for more than 20 years. This is my first time I have an audio product that makes direct damage to my health. And the problem happens on both the headphones and the line/XLR outputs connected to my main system.

 

[TommyGeenexus]

Got tired of waiting for a volume control implementation in FiiO Control, so i've decided to implement it myself.
If anyone got a K9 AKM version, an Android 12+ device and wants to try remote volume control, message me and i can link you to an application with volume control.

 

[Bob Ley]

Really glad you like the combo, i ordered two sets of mullard m8100 tubes, currently burning them in hoping for more warmth, i love what the stock tubes do to vocals but they’ve gotten a bit bright for me. All for the love of the hobby lol

 

[NicomiUdon]

I have tried to use it at very low level with the same result. My ears gets hurt and it is not for an extended period. I believe I start to feel the problem very quickly.
I have been an audiophile for more than 20 years. This is my first time I have an audio product that makes direct damage to my health. And the problem happens on both the headphones and the line/XLR outputs connected to my main system.

I love my K9 Pro AKM and use it every day.
However, it never hurts my ears.
This is an issue that concerns me as a user.

 

[Bozon]

I love my K9 Pro AKM and use it every day.
However, it never hurts my ears.
This is an issue that concerns me as a user.

Thank you for your concern. I have my K9 there on my rack collecting dust. I got tired of trying to solve the sound problems.

I got delivered a new DAC just today. The Gustard X26 pro.

So far a very good quality product on every sense. Working flawlessly and very smooth sound. It gets a little hot but that's to be expected as it is a fully class A biased product including the pair of 9038 pro chips that are running on current mode.

Fully discrete output stage without opamps. Really great on every way.

 

[WorksUnit]

I love my K9 Pro AKM and use it every day.
However, it never hurts my ears.
This is an issue that concerns me as a user.

See what you did there

@Bozon I can relate.
There are only a couple of products I have ended up hating in a chain. Maybe they were defective, but without buying two of the same how to tell...

AKM K9 on duty today as DAC into a Transformer- Coupled Tube amp.
Between that combination, there are so many gain options to get the best out of different music productions.

 

[rinderkappajoe]

Hey @FiiO
I have an eye on K9 Pro (BTR7 aswell) BUT one thing which is holding me back is the fact that the equalizer only works in Bluetooth mode.
Do you plan on making this available for USB mode aswell? And if so, how is the status?
Many thanks

 

[Knightsfan11]

Technical setup question for you all - If using my phone as the source, anyway of receiving calls while using this or any other bluetooth DAC/AMP through my headphones? If so, how would I achieve this?

 

[FiiO]

Hey @FiiO
I have an eye on K9 Pro (BTR7 aswell) BUT one thing which is holding me back is the fact that the equalizer only works in Bluetooth mode.
Do you plan on making this available for USB mode aswell? And if so, how is the status?
Many thanks

Dear friend,

The EQ is achieved in the Bluetooth chip, so it is only supported in Bluetooth mode in K9Pro.

Best regards

 

[FiiO]

Technical setup question for you all - If using my phone as the source, anyway of receiving calls while using this or any other bluetooth DAC/AMP through my headphones? If so, how would I achieve this?

Dear friend,

The microphone in the headphone is not supported when connecting to K9Pro. While using the K9Pro and receiving call, you could hear the sound from the other end still. But you would need to use the microphone in the mobile phone.

Best regards

 

[MPCK1967]

Hey @FiiO
I have an eye on K9 Pro (BTR7 aswell) BUT one thing which is holding me back is the fact that the equalizer only works in Bluetooth mode.
Do you plan on making this available for USB mode aswell? And if so, how is the status?
Many thanks

Why not use an EQ software on your computer? Something like Equalizer APO

 

[MPCK1967]

@FiiO
The webpage for the Fiio k9 pro says native 384khz decoding and up to DSD256 but this thread and elsewhere says 768/512. Which is correct? The website or this thread? I would imagine this thread

 

[simpleworld]

@FiiO
The webpage for the Fiio k9 pro says native 384khz decoding and up to DSD256 but this thread and elsewhere says 784/512. Which is correct? The website or this thread? I would imagine this thread

384khz/DSD256 is the max. The thread is incorrect.

 

[MPCK1967]

384khz/DSD256 is the max. The thread is incorrect.

Thanks