K9 Hot Issues Q & A

Why does the output switch and gain switch not respond immediately after switching?

In order to prevent the user from accidentally operating wrong or unable to adjust to the required position at once, the output switch and gain switch have been set to delay response. The system will respond only after the user operation stops, thus avoiding frequent response switching.

Bluetooth connection K9 use Aptx-Adaptive coding?

K9. When you need to use it, please connect K9 with a mobile phone installed with the latest version of FiiO Control APP, and check Aptx-Adaptive coding on FiiO Control, and K9 can support it normally.

Why does K9 use 9068as decoding chip, but does not support mqa? The sampling rate is higher than k9pro?

the MQA certification of desktop computers, MQA official requirements must be fully understood. K9Pro was only render, which was a special case at that time. K9 could technically support MQA, but could not pass the certification, so it did not do it.

K9 does not support MQA, but it supports UAC1.0/2.0 switching. The sampling rate is supported to 768K/32bit, which is a software trade-off.

sampling rate higher than k9pro?

our previous K9PRO series sampling rate supported less than 768kHz, because of MQA software reasons, after canceling MQA, the sampling rate has room to do it.

front panel three headphone ports, which one has the best sound quality

in theory, XLR4 balance port is not much different from 4.4 balance port, which is more balanced and has more thrust than 6.35mm

different earphone ports and different earphones will have different tastes, and the sound quality is not absolutely good or bad. It is recommended to compare and listen in person.

K9 support the drive-free feature?

support, can switch to USB 1.0 drive-free mode in fiio control, can decode PS5 and other devices

XMOS and DAC

XMOS is just a USB decoder, which is a device that restores audio to digital audio after USB protocol transmission.

XMOS is that it is completely asynchronous transmission, which is not affected by the front section or the transmission line, so there is no loss of sound

and AK4499 is an audio DAC, which restores digital audio to analog signals. The two functions are completely different.

the role of XMOS, which is equivalent to the master of the player

K9pro when connecting speakers

1. Generally, when connecting the power amplifier or active speaker, turn down the sound of the power amplifier or active speaker first, and then turn up gradually after connecting, so as to avoid explosive sound.

2. The volume in DAC mode cannot be adjusted and is maximum. If DAC function is used, please be sure to turn down the sound of power amplifier or active speaker first, and then turn up gradually after connecting to avoid popping sound.

3. When connecting speakers that cannot adjust the volume, it is recommended that K9 be adjusted to PRE output;

Why can't K9 recognize and use (USB) on win7 or win8 system computers?

provided us with USB DAC driver solutions. In 2021, the manufacturer has made it clear that it is no longer compatible with win7 and win8 systems, and only retains win10 and win11 system support.

, in order to solve the problem that users may make mistakes when upgrading XMOS firmware by mistake, we have decided to use a separate PID for each model of the subsequent new products after research, which is used as the basis for upgrading judgment. The original PID of Feiao's old model is shared. K9 uses a new PID. Version 5.30 and below cannot be recognized and needs to be updated to version 5.50 or above.

Therefore, 5.50 and above drivers must be installed to use K9, and K9 is not compatible with win7 and win8 systems.

How can K9 be recognized by computers on win7 systems?

currently has two programs:

Scheme 1: Feiao provides firmware to the user. The user finds win10 or win11 system computer and brushes K9 as the old PID

Scheme 2, Feiao provides firmware and operation tutorials to users. Users crack the driver according to instructions on win7 computer, so that win7 will upgrade K9 to PID to the old version after identifying K9

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