| General specifications |
| Name / Model No. |
K9 Pro ESS |
Hardware solution |
DAC: ES9038PRO*2, USB: XMOS XUF208, Bluetooth: QCC5124, LPF: OPA1612 * 2,
volume IC: NJU72315 * 2, AMP: THX AAA 788+ * 2, linear transformer：THAILIN/BingZi
|
| Color |
Black |
Volume Scroll |
Potentiometer+ADC Sampling |
| Weight |
≈2750g |
Channel balance |
L12~R12 (0.5dB per level) |
| Gain |
L/M/H |
FiiO Control |
Surpported |
| Bluetooth format indication |
Surpported |
Sampling rate indication |
Surpported |
| Firmware upgrade |
System firmware and Bluetooth version can be upgraded via USB |
Deep standby |
Long press the multi-function button for about 3s |
| Low battery reminder |
/ |
Dimensions |
≈200x224.5x72mm (excluding feet) |
| Bluetooth transmission |
/ |
Bluetooth receiver (5.0) |
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 |
Charging indicator |
/ |
| Maximum supported sampling rate |
384kHz-32bit/DSD256（USB DAC） |
Recommended headphone impedance |
16~600 Ω |
| 192kHz-24bit (coaxial) |
| 96KHz-24bit (optical) |
| Buttons and interfaces |
| Button |
Physical key + toggle switch |
USB |
Type-C, USB B (data transmission) |
| Single-ended line input interface |
RCA socket |
Balanced line input interface |
4.4mm balanced socket |
| Spdif in |
Optical fiber socket |
Digital coaxial input interface |
RCA socket |
| Balanced output interface |
4.4mm socket, XLR4 balanced socket |
Headphone output interface |
Standard 6.35 mm socket |
| Balanced line output interface |
XLR3 balanced socket |
Single-ended line output interface |
RCA socket |
| Power parameters |
| Power supply |
AC 110-115V~/AC 220-230V~ （Recommended） |
Battery capacity |
/ |
| Charging time |
/ |
PO battery life |
/ |
| Audio parameters |
| Single-ended line output performance parameters |
| THD+N |
＜0.00042%(1kHz/10kΩ/dbA) |
SNR |
≥123dB (dbA) |
| Crosstalk |
≥115dB (1kHz/10kΩ) |
Noise floor |
＜1.9μV（dbA） |
| Frequency response |
20Hz~20kHz (-3dB) |
Line Level |
2.5Vrms (1kHz/10kΩ) |
| Balanced line output performance parameters |
| THD+N |
＜0.00025%(1kHz/10kΩ/dbA) |
SNR |
≥128dB (dbA) |
| Crosstalk |
≥125dB (1kHz/10kΩ) |
Noise floor |
＜1.9μV（dbA） |
| Frequency response |
20Hz~50kHz (-1.5dB) |
Line Level |
5Vrms (1kHz/10kΩ) |
| Single-ended headphone output performance parameters（6.35mm） |
| Continuous undistorted output power 1 |
≥1.1W（16Ω / THD+N＜1%， AUX IN) |
Output impedance |
＜1Ω（32Ω） |
| Continuous undistorted output power 2 |
≥2.1W(32Ω/THD+N＜1%，AUX IN) |
Crosstalk |
≥75dB (1 kHz/32Ω，AUX IN) |
| Continuous undistorted output power 3 |
≥281mW（300Ω / THD+N＜1%，AUX IN) |
THD+N |
＜0.00033% (1 kHz/32Ω/dbA) |
| Noise floor |
＜2μV（dbA，AUX IN)
＜3μV（dbA，UAC/SPDIF/BT IN）
|
SNR |
≥129dB (dbA) |
| Frequency response |
20 Hz~50kHz (-1.5dB) |
MAX Output Voltage |
＞26Vp-p |
| Balanced headphone output performance parameters（4.4mm/XLR4） |
| Continuous undistorted output power 1 |
≥1.1W（16Ω / THD+N＜1%) |
Output impedance |
＜1Ω（32Ω） |
| Continuous undistorted output power 2 |
≥2.1W（32Ω /THD+N＜1%) |
Crosstalk |
≥114dB (1 kHz，AUX IN) |
| Continuous undistorted output power 3 |
≥1.1W（300Ω / THD+N＜1%) |
THD+N |
＜0.0003% (1 kHz/32Ω/dbA) |
| Noise floor |
＜3μV（dbA， AUX IN）
4.5uV(dbA,UAC/SPDIF/BT)
|
SNR |
≥123dB (dbA) |
| Frequency response |
20Hz~50kHz (-3dB) |
MAX Output Voltage |
＞52Vp-p |
