| General Specifications |
| Name/Model |
K9 AKM |
Hardware Scheme |
DAC: AK4499EX+AK4191EQ, USB decoding: XUF208, Bluetooth: QCC5124, LPF: OPA1612*2, Volume IC: NJU72315*2, AMP: THX AAA788+*2, transformer: linear transformer |
| color |
Black |
Volume Control Type |
Analog Potentiometer (ADC sampling) |
| Weight |
Approximately 2660g |
Channel Balance |
L12 to R12 (0.5dB per stage) |
| gain |
L/M/H |
FiiO Control |
support |
| Bluetooth format indication |
support |
Sample Rate Indication |
support |
| Dimensions |
200x 224.5x 72mm (excluding foot pads) |
Firmware Upgrade |
System firmware upgrades through USB, Bluetooth firmware upgrades through FIIO Control |
| Deep Standby |
Long press the multi-function key for about 3 seconds |
Low Power Reminder |
None |
| Bluetooth Transmitter |
None |
Bluetooth reception (5.1) |
AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive |
| Bluetooth format indicator |
SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green |
Adapted impedance |
PO:8~150Ω |
| Maximum supported sampling rate |
768kHz-32bit/DSD512(USB DAC) |
BAL:8~350Ω |
| 192 kHz-24bit (coaxial) |
| 96 KHz-24bit (fiber) |
| Keys and Interfaces |
| key |
Solid key + toggle switch |
USB |
USB B*1, Type-C*1 |
| Single-ended input interface |
RCA Socket |
Balancing Line Input Interface |
4.4mm balance socket |
| Digital Fiber Input Interface |
optical fiber socket |
Digital Coaxial Input Interface |
RCA socket |
| Balancing output interface |
4.4mm socket, XLR4 balanced socket |
Headphone output interface |
standard 6.35mm socket |
| Balancing line output interface |
XLR3 balance socket |
Single-ended line output interface |
RCA Socket |
| Power Parameters |
| power supply |
AC 100-120V ~/AC 220-240V ~ (recommended) |
Battery Capacity |
None |
| Audio Parameters |
| Some performance parameters of single-ended line output |
| distortion plus noise |
＜0.00027% (1kHz/-0.7dB@10kΩ) |
signal-to-noise ratio |
≥119dB (A-weighted) |
| channel separation |
≥112dB (1kHz@10kΩ) |
bottom noise |
＜2.9μV (A-weighted) |
| frequency response |
20Hz~50kHz: damping＜-3.5dB |
Line Output Level |
2.3Vrms (1kHz@10kΩ) |
| Performance Parameters of Balanced Line Output |
| distortion plus noise |
＜0.00020% (1kHz/-1dB@10kΩ) |
signal-to-noise ratio |
≥128dB (A-weighted) |
| channel separation |
≥122dB (1kHz@10kΩ) |
bottom noise |
＜1.9μV (A-weighted) |
| frequency response |
20Hz~50kHz: damping＜-3.5dB |
Line Output Level |
4.7Vrms (1kHz@10kΩ) |
| Headset Output Part Performance Parameters (6.35mm) |
| Output power 1 |
L+R≥1000mW+1000mW (16Ω, THD+N＜1%, AUX/UAC/SPDIF/BT IN) |
output impedance |
＜1Ω (32Ω) |
| Output power 2 |
L+R≥1500mW+1500mW (32Ω, THD+N＜1%, AUX/UAC/SPDIF/BT IN) |
channel separation |
≥76dB (1kHz@32Ω) |
| Output power 3 |
L+R≥200mW+200mW (300Ω, THD+N＜1%, AUX IN) |
distortion plus noise |
＜0.00026% (1kHz/-1.3dB@32Ω) |
| bottom noise |
＜3.0μV (A-weighted) |
signal-to-noise ratio |
≥127dB (A-weighted) |
| frequency response |
20Hz~50kHz: damping＜-3.5dB |
peak output voltage |
＞21Vp-p |
| balanced headphone output part performance parameters (4.4mm/XLR4) |
| Output power 1 |
L+R≥1000mW+1000mW (16Ω, THD+N＜1%, AUX/UAC/SPDIF/BT IN) |
output impedance |
＜1Ω (32Ω) |
| Output power 2 |
L+R≥2000mW+2000mW (32Ω, THD+N＜1%, AUX/UAC/SPDIF/BT IN) |
channel separation |
≥116dB (1kHz@32Ω) |
| Output power 3 |
L+R≥780mW+780mW (300Ω, THD+N＜1%, AUX IN) |
distortion plus noise |
＜0.00029% (1kHz/-9.5dB@32Ω) |
| bottom noise |
＜5.2μV (A-weighted) |
signal-to-noise ratio |
≥124dB (A-weighted) |
| frequency response |
20Hz~50kHz: damping＜-3.5dB |
peak output voltage |
＞42Vp-p |
